What you're talking about are extremists.

There are currently around a hundred thoudand people in concentration camps at the souther border. As of 2018, the DHS reported that they had "lost" 1,488 children. The FBI itself, years ago, published concerns about nazi inflliltration of police and federal organizations. US police forces contain an entire ecosystem of cop gangs, many of which are nazi. These same police forces operate blacksites and execute civil rights organizers. We are currently sending another several billion dollars of weaponry to arm guys with sonnenrad and swastika tattoos. What the fuck have you been smoking if you think the mainstream isn't extremist.

how can you identify extremists if you're not supposed to talk about people's politics? how can you even tell what constitutes extremism? this is such a "let's get back to brunch" take.

No it doesn't. Ideology is real. Pretending it doesn't exist is also Ideology.