The centrist view, the average American, would be considered a leftist by conservatives. This is why they think they're getting brigaded everywhere. They are. Their beliefs are unpopular.
The only reason the US Republican party is viable while being so far right is structural voting advantages. That's why they've lost the popular vote almost every time for 30+ years. That's why 50% of senators are Republican when only ~43% of the populations votes R.
On the internet where these artificial advantages aren't present it's much more obvious that Republican policy is broadly unpopular, and conservative opinion is the minority. Or more accurately, the moderate left is actually the center, and the average Republican is substantially far right.