Which reason is most important to why Hitler rose to power?

Hitler rose to power because of a combination of factors. Some were deep rooted and some were triggers. When asked which reason is more important each factor can be debated for the relative importance. In the end each factor has a relationship to next one and they all interlink.
The Treaty of Versailles was a real problem in German society. The Germans disliked it for many reasons such as guilt for the war. This was simple but harsh. Germany had to agree that it was Guilty of starting the war. The size of the German army scared the Allies but especially France. The treaty then cut the German armed forces to a level way below what they were before.
Germany had all of their army and resources taken away from them.
They were only allowed:
¨ 100,000 men
¨ No submarines
¨ No air crafts
¨ No tanks
¨ 6 battle ships
¨ Conscription banned
¨ Rhine land demilitarized
They did this because France was worried they would attack them and Germany was ups...