I guess some people are over-sensitive .
Bottom-Line syndrome. Get rid of anything that reflects negatively on their game.

Developer erased my topic on Discussions about mistakes in game and didn't accept my friend invitation. I think I'm gonna avoid their games in future.

Yeah ! I 'disabled' the bugger.

I chose in game to "Kill" principal, instead of "Disable". So, he should be dead and first texts are correct, but then suddenly they say he's fired - that would make sense if I disabled him, but not killed.

If you haven't done so, talk to his wife/widow ?