Lemmy's community is much better than Voat's. Voat existed to give a home to users who were too toxic even for Spez. Lemmy is pretty good at stopping that.
Also, given how open Nazis can be on reddit (e.g the admins are fine with a guy names after this: https://en.wikipedia.org/wiki/Caravan_of_Death running a national politics sub), the Nazis incredible stupid.