Proud boys aren't a paramilitary, you're thinking of the regular cops.

FBI was an actual law enforcement organization, but has been gutted.

Lol

The CIA isn’t a boogie man inside the US.

Lol

I'll give you that I forgot to include the NSA among your secret police apparatus though.

Masked thugs working for the state vanishing people without warrants is sort of the basic definition of secret police.

All of them are masked! Even your cops are masked thugs who kill and disappear people without warrants. They have black sites!

I hope you realize how stupid that sounds

I sense you would also moralise about Napoleon being a "fucking monster". Lenin was a historical figure and he found himself guided by forces of the time. Aside from his rhetorical skill he wasn't particularly special, nor was he a super nice person. It wouldn't matter all that much in the grand scheme of things if he was.

I am not saying this to dismiss your qualms. Mistakes were definitely made. Revolutions need to be learned from and its conducive to revolutions that violence is kept at a minimum. But let's not fool ourselves into believing that we can all hold hands and dance socialism/communism into existence. This sort of change has a lot of potential to be messy. I don't need to tell you this, but the Russian revolution was deeply troubled by a strong counter-revolution.

Let's get to your point about going to China. Libertarian professors are employed at Chinese universities, there are regular expressions of protest that don't land the protester in jail, think of nail houses, and social media figures as well as journalists who have criticised China in the past have travelled there without too much trouble. I don't think the state cares all that much about your dislike, they have bigger fish to fry. The populace is also quite content, so your agitating, if you were to commit to it, would attract confusion more than anything else. Sure, you might have the cops called on you. What happens then though? At worst you'll be sent back to whence you came as China doesn't want to get into diplomatic rows. You are unlikely to become an O. Warmbier.

Please stop this narrative. Western Marxists/communists and their purity posturing is exhausting. Say what you will of the CPC but it is a party that has taken China from backwater country to world leader within 60-70 years. Do you want China to instead be "democratic" the way the US is?