That wasn't the things that Hitler built. He created a more robust military industrial complex and jobs for a struggling economy.
The infrastructure improvements were only as far as they supported the new MIC he was building. It still meant more jobs for people....so the people loved him for that.
Then there were the youth programs in all the schools....basic indoctrination of how He was the Father instead of God. All the attractive kids were easily conned into marching with rifles and neckerchiefs....
Made everyone want to be marching for Hitler, and accepting of the propaganda pushed in schools. Almost identical to the BLM, DEI and Trans stuff currently being pumped into children today. (You are your own God and morality is fluid) Anyone disrespecting Hitler or his ideology were insulted, belittled, cursed at, argued with etc...no different from the progressives do today.
Those who dont know history are doomed to repeat it.