If you imprison someone for life, you’re still keeping others safe though?
No, containment doesn't work to stop fascism. As long as the person can talk, they can spread it.
And killing someone who puts out fake news doesn’t necessarily stop those news from spreading, worst case, you have a martyr.
Yes, it does work. We already found deplatforming fascist works, we just stopped doing it. That would just be "deplatforming them from earth".
As far as martyrs go? Well, that makes it easier to identify the next round of fascists that need to be eliminated.
We learned that lesson in the 1940's.
I’m from Germany and the death penalty has been forbidden since the 50s, for context.
And that's likely one reason why the AfD is gaining power there.