That was the reason stated, which is not the same as it being the actual reason. This is the strategy being imposed against conservative voices at large.
This is a strategy imposed against racism and violence. If conservative voices include a lot of racism, then, yes, I guess they should stop being racists.
The "everyone I don't like is a racist" debate strategy isn't a good look, but "every conservative is racist" is just pathetic.
There was literally zero racist activity on The_Donald. The mods were very transparent and showed EVERY ACTION once they hit quarantine (to show they didn't deserve to be quarantined). The only racist posts came from new accounts / people who had never posted in The_Donald that were immediately removed by mods.
Maybe turnabout is fair play. After all, one of the main tactics of conservatives is to underfund or defund programs, then point at them and say "look, it doesn't work!" to try and get them shut down.