Liberal does not mean leftist outside of the USA. Liberal actually means what is called libertarian in the USA.

bullets and bombs

I think it's enough to just do: arrests of leaders (and banning them from public speaking but for life) + breaking up the party + outlawing the party + banning people who decide to take up the mantle of/act as a declared proxy for the party and attempt to visibly pick up where they left off.

That last one I learned from my own country''s current situation: in Romania, a crazy far right candidate came out of nowhere (on the wings of illegal undisclosed campaign donations) to win the first round, and as soon as that happened our mainstream far right party's candidate started supporting him. Then they canceled the election because of the undisclosed donations (he literally declared 0 campaign spending!) so now, in the redo of the election, this other guy is basically running as his proxy and will likely try to appoint him PM if he wins.

Weimar was a small civil war between soldiers who returned from WW1. That's why both the left and the right had fighters. Where should the fighters who shoot the bullets come from now?

The fascists came to power because the elite feared that the communists could win. Otherwise, despite massive manipulation, the fascists never got an absolute majority.

There are many issues that other parties simply ignore. There would be far less voteres for the AfD if the other parties would listen. The AfD started with the demand that the rules about euro stability shouldn't be ignored. That's not a fascist position.

But starting and organizing a violent opposition seem like so much effort. And I really have to finish some shows I've been watching.