Should the Weimar Republic have banned Adolf Hitler from becoming Chancellor in 1933?

[Skill and Chance]

Maybe?  This would be extremely high risk because you-know-who's psychotic supporters would immediately take up arms, and they clearly had disproportionate military support by this time.  Without extreme Lend-Lease Act level economic/military aid from the future Allies (profoundly unlikely in those isolationist times), I don't see how the pro-democracy coalition could prevail.  So the German Civil War probably ends much like the Spanish Civil War and gives the fascist coalition a ~5 year head start in militarization, which could make the ultimate outcome of WWII even worse (even up to and including Germany getting the atomic bomb 1st).  However, there would still be a non-zero chance of killing the future Axis in the cradle.