Is having 'moderators' a failed social technology?

Today, I was cancelled from two social media platforms. After questioning a redditor about his statement about a legal topic, and him responding, and me reviewing the case he cited and responding, it seems he just banned me (was not able to comment further - just read 'error' or something).

Then someone posted a news issue saying how much violence there was in the city/state I live in, and I posted stats (literally facts, numbers, putting it in context with the US's cities and states. I received a comment from the platform saying my comment had been removed.

I generally don't post comments on Facebook, but thought I'd contribute today, but after that I see no reason to try to comment on it in the future.