I said it doesn’t matter if the Nazis were right wing or left wing, what matters is that they were criminals. Then that person said that mass murder and racism is only aligned with the right, so I showed him/her that that is wrong, murder and racism can also happen on the left.
The point being that just because in the past there were rotten apples in the left/right, it doesn’t mean that being in the left/right makes you a rotten apple.