They can look for themselves and see: higher education is moving out of reach, the country has been at war for 20 years, there have been 2 major financial crises, a pandemic was left to rage unchecked for several months, the social net is desperately tattered, the rich are getting richer and the poor are getting poorer, there aren’t enough jobs, gig work doesn’t provide benefits, minimum wage is not a livable income
You don’t need indoctrination, this is simply observable fact. If this is all you have known in your young life, you are naturally going to conclude that there has GOT to be a better way