The Nazis were state actors operating at the direction of the state. Hamas is a terror group that forced its rule on the people of Gaza outside of the political process. Hamas operates independently of the recognized government of the Palestinian territories and is a non-state actor. The reason the distinction between the two is important is because many people believe that military force is the answer to defeating Hamas and are supporting Israel's current response to the October 7th terror attack based on that assumption. What works when fighting standing armies doesn't work when fighting terrorist groups.
Military force works on state actors because once the state accepts defeat, the attacks committed by the state end. With terror groups, military force has the opposite effect. When a military response to a terror group is too overwhelming, like we are seeing now in Gaza, it only benefits the terror group. They will gain legitimacy among the people affected by the military campaign, which often leads to more support and more recruits to carry out future attacks.
The only way to defeat Hamas is to recognize this difference and for Israel and the international community to respond to them in the appropriate way. I gave an example of the proper response to Hamas in this
post.