If you apply that rule to those who are doing violence against you, you will be dominated by those people. Advocating for violence in self-defence is fine.

Pretty sure the motto here is, Nazi Lives Don't Matter.

No.

Lemmy.world is reddit.world, so of course such a right wing instance would be anti-violence against the right.

Many of us are not spineless rightwing shits, and will fight back against injustice.