I think their worst nightmare just turned into a reality with this assassination.
The unholy marriage between goverment and big businesses ensured their control over policy and economy with an iron fist, the legacy media was there to cover all of their asses every time something went wrong, through the FBI, the patriot act and mass media they where capable of infiltrating any and all groups and destroy them before they could solidify into an actual threat to them, for all intents and purposes they had won.
Except there's one small problem they have no defense against, lone wolf attacks.
Was the assassin right wing? left wing? did he vote Trump or Kamala? was he part of a terrorist group? catholic? protestant? atheist? It doesn't really matter because they can't make a scapegoat out of his beliefs since he left the motive clear, he saw someone done wrong by the healthcare system of the US and he sought vengance on whom he perceived had the wheel at the machine that hurt either him or others.
Will he be arrested? most likely, the mass surveillance system will find him eventually but it would be nothing more than a consolation price for the real terror of evil people in power is that anyone who's hurt unjustly by the system can become a lone wolf.
Will the CEO be replaced? he probably already was, but i assure you the new guy won't be making public appareances any time soon.
While the assassination no doubt put the fear of god into a couple of them i think what most are worried about is not so much a single kill, but that the general consensus is turning the killer into a hero.
Interesting times indeed