I wouldn't liken Thanos to Hitler. He had a different mission and it was one people over another.

The thing that could have made it fair is if Thanos was also on the random list... but I figure, if he did indeed turn into dust, the Avengers would get the stones back and reverse everything and we'd be at square one....
Having said that, we know Captain Marvel will come and she's going to fix things ... haha... it takes a woman 😊