If you're right and you aren't willing to actually communicate why, or worse, if you're right and you don't even understand why, you might as well be wrong.
If you're going to argue with people on the internet, and I know you are, either go full irony or actually take time to work out an argument that you know is going to be persuasive, none of this halvsies shit.
I was on the edge of becoming a leftist for like six months. That's literally how long it took for me to even be exposed to the idea that capitalism is bad for inherent and structural reasons, and not because of all the really obvious shit that liberals also disagree with but think can be reformed away.
Why don't you just lead the way, hot shot? Give me some of those persuasive arguments in descending order of their power of leftist seduction.
If you're arguing against capitalism and you don't mention at least
(A) the problems that persist even with the most ideal, sanitized, socdem form of capitalism
(B) the impossibility of meaningful reform against the threat of wealthy interests
The best you can do is make a reformist think we need to reform even harder.
All good internet dorks have heard of the paperclip maximizer problem: an artificial intelligence that pursues a seemingly benign end to such an extreme that it kills the planet.
We've already invented one of those. It's called capitalism. Capitalism is destroying the planet to give us slightly bigger TVs, and it will perpetuate itself until we turn it off.