On February 28th, 1993, the federal government attempted to "smack down" a bunch of right-wing Americans in a rural Texas community called Waco. This attempt resulted in a 51 day siege that ended not in some front page triumph, but instead in the death of most of the residents, and countless children.
This "smack down" combined with another incident out in Idaho the year prior resulted in two individuals doing this to a federal building:
What these three incidents (Ruby Ridge, Waco, and the Oklahoma City Bombing) all have in common is 1) They occurred within the span of less than three years, 2) resulted in the death of at least one trained federal officer, 3) resulted in multiple deaths, 4) were directed against/by fringe rightists (i.e. not mainstream conservatives), 5) occurred in a time when America was more homogenous, be it along racial, religious, or political lines, 6) occurred under a healthy economy, and not the post 08 zombie economy, 7) occurred when gun control was less resisted (AWB was signed into law in 94),

didn't occur in the decade after nation wide race riots, 9) didn't occur in a time of forced government vaccination (whose effects were lied about by government officials) and unconstitutional lockdowns, 10) didn't occur in the wake of a stolen election, 11) didn't occur after the near assassination of a presidential candidate (on top of lawfare to imprison him on trumped up charges), 12) didn't occur in the midst of massive illegal demographic shift allowed to happen to make a political majority into a minority, and 13) did not occur after hundreds of right-wing Americans were unlawfully confined in prison for years without trial for a riot.
Even after taking all that into consideration, all three events were a very serious black eye for the federal government. Oklahoma remains the largest act of domestic terrorism on US soil, and is second only to 9/11 in death count. Ruby Ridge, and Waco continue to be routinely discussed by right-wingers thirty years on. Including the attempt by the FBI to get the military to come help, which was denied. Whatever can be said of modern federal law enforcement, how they respond to right wingers has changed from what they did before. We haven't seen another Waco, and therefor we haven't seen another Oklahoma, and the feds want to keep it that way.
We can argue over the lack of federal fairness when it comes to the response to left or right wing activity the federal government does or doesn't like till the cows come home. What I hope you'll agree with however, is that there is a clear rise in tension, not merely amongst fringe rightists, but amongst the public as a whole. We as a country are more accepting of political violence than at any other point in the last 30 if not 50 years. We are armed, we are better trained, we get endless jokes from the left about larping right-wingers playing soldier (which the left is increasingly doing themselves). We just had not one, but three separate armed attacks on federal agents by left-wingers in the past month. We are headed toward some sort of internal conflict at the rate things are going. Some do make the very creditable argument that we are already in one, and we're all really just waiting for it to finally blow up.
When it comes to "security forces" the only real security force in America are the state national guards. The federal military is not by law permitted to operate on American soil unless the insurrection act is invoked, It is of course a forgone conclusion that it would be enacted by a democrat president with in hours of a right-wing summer of love starting, let alone a proper rebellion/revolution. However, the federal military is not big enough to cover the entire nation in a similar summer of love scenario. Especially if that summer of love quickly translates into 1776 or 1861 2.0. Which means it'll fall to the national guard to do most of the actual line holding. With the fed units acting as the hammer for trouble areas. Everything else, local or state police, the various federal agencies (FBI, ATF, DEA, Marshalls) are not a military force, and are incapable of conducting anything resembling military operations beyond a very limited scale. As with the response to Waco, once the Branch Davidians, armed with nothing more than common semi-auto rifles opened up on the ATF, they were powerless to do anything but sit and try to keep the BDs contained in their compound. It took getting tanks from the army (which the army did not operate) to get the ball rolling on crushing the Davidians for example.
The feds are very careful when to comes to "smacking down" right-wingers these days. They have to be, and their smacking is very dependent on not overstepping the very unclear line between sparking mere outrage, and open revolt.
We already have organization for what society will look like after the revolution. The vast majority of right-wingers simply desire a return to the constitution, and the government it outlines. Organizing on an action bases for violence to enact revolution right now is pointless. The system still responds to our wants enough to be an useful avenue of redress. Any action organization such as for protesting ought to be small scale, local. Your family, neighbors, fellow church members, co-workers. You should never organize over the internet. In person, and well within the legal bounds. The idea ought to be like the minutemen of yore. Not looking to start something, but ready to respond if something should happen. The British eye of Sauron was far more effective than the current eye of Sauron is now. The redcoats were within their legal system's right to confiscate the arms of the militia at Concord. Something the current eye cannot do. The use of electronic communication is far more advantageous to us than it is to the government. We can use it to spread info on how to organize, how to prepare, and train; and on government actions. There can not be some secret operation on the feds part to start confiscating guns without a electronic blackout, which would be good enough heads up for people to be on guard. There can not be some secret black bagging operation without somebody connecting the dots with hours of it starting. If the government is gonna crack down, they have to win within the first month, and they have to keep it civil enough to avoid another waco, otherwise they've lost.