100% monkeys were not meant to have real discussions behind an anonymous wall. People act differently with little to no repercussions. Add in vocal minorities, group think, bots, and you have a recipe for hate. Good well meaning people screaming at each other from the same tent is pretty obvious on Reddit and moreso on Lemmy but it's nothing compared to Facebook and Twitter which are more representative of populations.
I'm about to go full boomer here. The Internet even pre social media was the end for globalism and what most of the west thinks of the good days (yes I realize it was far from perfect but you can submit the trend has gone changed downwards with regards to global stability). While yes it gives people the ability to safely explore and learn it more often gives a voice to shitty dumb and uneducated opinions and ideas without repercussions. Add social media and essentially the digital communications wars governments and zealots are engaging in at a scale we've never seen.
No. They federate all of their content. By publishing that content they have approved it. And we know that they have had a decision they have made and will continue to make. So yes LW does support violence.