They like McCarthyism. They think McCarthy was on to something. They think they're really were communists everywhere and still are.
15 years ago I was talking to my aunt, a staunch proud Republican, Union teacher at her local university, and sole inheritor of her father's fortune. When I compared America's response to the war on terror while using McCarthyism as an unfavorable comparison she said, "not everybody thinks that's a bad thing."
I had to ask her to clarify, "McCarthyism? Isn't it fundamentally unamerican to prosecute people for their thoughts, words, and association with other people? Doesn't the first amendment mean anything?"
What she said chilled me to my bones... "The first amendment isn't meant for those people."
That's who they are. Conservatives are people who think you don't deserve rights if you disagree with them.