Trying to avoid Godwin's law here as much as I can...........
Tyranny didn't propel Hitler into power. A completely screwed up country - run by a liberal regime BTW - is what "propelled" the Nazis into power.
As far as being a "tyranny" - it was pretty much only a tyranny if you were on the Nazi's shit list. Regular Germans thought they were living better at the time. Superhighways. Volkswagens. Everybody had a job. Etc.
It wasn't until after the war when the whole thing fell down into a heaping pile of rubble and the country was split into two parts - and millions upon millions of Germans were dead , that the majority started thinking the Nazis were complete and utter shit.
Compare that against the communist regime in Russia - and there's a big difference. The commies were killing people off right from the get go. They were genociding "enemies of the state" right from the start. And you could be in the in crowd one day - and breaking rocks in Siberia a week later.
Solzenitzyn wrote a lot about what it was like in the Soviet Union. NKVD went thru entire cities at night and just gathered people up by the hundreds or thousands. Yes - the Nazis went after the Jews , and they also did stuff like clear out the "defectives" from convalescent homes and so forth, but for many if not most Germans living under Nazism wasn't a never ending cycle of fear and "tyranny" as it was under the Soviet communist regime.
One of these is not exactly the same as the other. And things change over time. If we had actually been conquered by the Nazis ( a premise I find laughable in the first place) - then if we were still being ruled by them 72 years later you can be sure it wouldn't be exactly the same kind of social and political environment that it was during the WW2 years in Europe. That's why I said: You likely would not have had the church shooter - the guy would have been dealt with and dealt with harshly before he even got as far as he did. I don't recall the Germans being all that lenient towards paperwork screwups. You also wouldn't be dealing with BLM, Antifah, pussy hat marches, liberal freak outs in the media - etc.
Yeah. You wouldn't have a church shooter because in 1934 the Nazi Party confiscated all privately owned weapons.