It probably has a lot to with actual nazis being dead and anyone called a nazi today having basically nothing in common with the group that was the nazis.
I mean you probably know that, but I'm pretty sure threatening violence against any group, no matter what group, violates their rules. Making exceptions would just increase their workload.
Reddit banned me once for saying someone should take out Putin. Putin. So should we not want one of the most genocidal dictators we've had in some time gone? Ok.
Remember that video of Ron perlman saying that a studio executive might lose their house for what they said? I commented something to the effect of ' if Hellboy said it's time to start burning down houses I would show up'
Calling for violence is against the rules on nearly every social media site. You are claiming that getting banned for that is indicative of them siding with the nazis or something.