I don't disagree. I'm potentially splitting hairs here but the focus on calling it revolution specifically was in consideration for those who benefit from the stagnation and thus being continuously at odds with those who do. Overthrowing the "order" is revolution, so anything that results in a grand shift of the status quo, even peacefully at the ballot box, could constitute. The reason why the illegals/rioters actions don't constitute as such is because they're not desiring change, they merely want to continue the status quo, the one which enables and thus benefits them by allowing them to continue their criminal activity (being in the USA illegally) and, yeah, "raid the coffers" (live on the taxpayer's dime). Anyone not within the group of rioters/illegals who enables or gives excuses for their behaviour benefits in some fashion from what they're doing.
As for the non-Mexicans/illegals joining them? For non-whites it's probably solidarity with a fellow minority group, but white liberals/leftists are harder to pin on exactly but I have my own theory why this came to be.