I don't wanna absolve any of the evil shits in Trump's circle, or among the MAGA crowd, of blame in this. But I think the biggest issue of all is the anglosphere's love for first past the post electoral systems. There's no excuse for FPTP, and while they often have a positive side effect in giving crazies zero representation, they're vulnerable to crazies taking unchecked control of the system.

Sure, MAGA would've been a large congressional embarrassment in a proportional system. But they wouldn't run the show.