Because they mostly don't know/hear about it, and when they do, they hear it from people/sources they've been told over and over and over again hate America and are traitors.
In short, the nonstop gaslighting bought and paid for by wealthy regressive-right elites, by Broligarchs, is working.
The only way to change this dynamic is by increasing the variety & frequency of telling our stories, true stories of who is to blame, and to do it using ...