When I debate someone from the far left. I win the argument with one thing usually.
I tell them.
I'll agree with trying your policies under ONE condition.
They usually say. What is that. I say you must tell them to ban ALL weapons from the police and miltary.
I say the reason why I disagree with your pro state ideas. Is because I believe.
That human beings can easily become corrupted when they control a miltary force.
I say... the reason why these pro state ideas have killed tons of people.
It's because the leaders of the state. Now fell they can do anything because they have the guns and law on their side.
Usually this makes them think.
This works for me. Because most far left people are Anti-Gun.
So I take their anti-gun idea and use it to make my argument of why Socialism/Communism is dangerous.
It's hard to prove them wrong because of google. But ask them to prove you right instead.