(By the way, we call this nation a "melting pot"... which means we enjoy numerous aspects of numerous cultures in any way that we wish. But make sure that you eschew any invention or improvement by an American... including electricity, air conditioning, Free Speech, your car, and mostly everything else. You wouldn't want to appropriate anything American, right? And quit speaking English, while you're at it. It's an affront to all Mexicans.)
They seek to undermine and destroy Western Culture.
Once you accept that premise, more of what they say and do makes sense.