The truth is Beria had the easiest job ever. Inventing excuses to murder someone is actually trivial when you put any effort into it. Same with coming up with reasons to imprison them. That, and raping and murdering teenagers, he did a lot of that.
When you want to rationalize a reason to wish death on someone you disagree with, its just easy to come up with some vague excuse about diffuse harm caused by their ideas.
Show me the man, I'll show you the 100 people he's killed by saying something controversial.
God only knows that in their minds J K Rowling must have a higher kill count than Pol Pot right now.
You're making a mistake at assuming it's a direct equivalent in an argument, though. Often times people use figures like, Pol Pot or Hitler, (like you just did) to make a point, not make two things equal.