well, let me tell you about 'Hitler-ish' American professors..........
I have been in a similar situation, but I didn't go on a killing rampage.
This very famous Amrican professor at GA-Tech hired me without even reading my CV properly. All my original ideas not only got turned down one by one, but on top of that it made my boss more and more offended and hateful towards me. He hired only colored people from third-world, who massage his ego and say "yes sir", "yes sir" all day round. He follows one blind direction of research that he has been doing for ever, over and over and over, and forces his group to work only in that direction. Anybody with exceptional views are considered enemy. "You work for me, you will do only this and nothing else."
He hired me on "dog-salary", even a dog wouldn't be satisfied with that salary. When I told other Americans outside the University about the amount of my salary, they first thought it's per week! When I said, it's per month, they couldn't believe it, they thought it's a lie. I paid a huge amount of tax, huge amount of house-rent, power, gas, water, heating..., my bank balance was always negative, so I eat only one meal per day. He forced me to work in the week-end.
Then one day all hell broke loose, I had an exploding breakthrough in my research results that comes maybe once in a century, and you know what he did? He gave it to his favorite junior student!
But I didn't go on a killing rampage. I was devastated, had nervous-breakdown, but I stood up again, put all these behind me, moved to Europe, continued my research career peacefull and successfully, and never looked back to this Hitler again.
Who can tell? This professor seemed very jovial on the outside, just like Aidan Quinn's character. Popular, respected, friendly, cheerful guy, but trust me, you better watch out the teeth and claws. And this is just one example out of thousands out there.