Indeed, and that is perhaps the most important lesson of Hitlers rise - dangerous people will always exist, and so it is critical to have systems that are resilient to them, and not allow them to be hollowed out just because the current crop of leaders looks like they can be trusted with more power and less oversight, because who knows what kind of madman will get power next.
replyAll events have multiple causes. But history turned on what he did, and would have been very different otherwise.
reply> what he did
replyObviously, calling out for violence and building organizations that commit atrocious acts of violence is a bad thing.
However, it is really hard to do without the help of others.
If you start arguing that your country should invade your neighbors and mass murder various types of people, the people listening have a choice in how they react - do they politely remind you that we're generally happier and richer if we're nice to each other and "treat others like we'd like others to treat us", or shout "JAWOHL MEIN FURHER" and go invade neighbors and mass murdering undesirables?
The problem isn't always the guy shouting hate, it's the crowd listening and implementing hate.