The people a society considers its "winners" are those who have benefited from said society or actively exploit it for their gain. Naturally those people will be generally less critical and more accepting of the status quo. That's especially true if opposing the system comes with negative effects to one's social capital or financial future. People who already have little to nothing aren't scared of losing it when they don't conform. Of course there are exceptions and those at the top are generally so insulated from their actions having any meaningful consequences that they can just afford to do whatever, but you don't exactly have to be a fucking Marxist to figure out why disenfranchised and alienated people are the most likely to want things to be different, whether they put their hopes into left-wing movements or have their revolutionary potential destroyed by reactionary forces.