Do you think it's normal that I have homicidal ideations sometimes?
It's hard to say. Why are you having homicidal ideations?
A person who was trusted killed me and my troop in a game.
While it can be upsetting to have people kill you off in games, it is not good to have homicidal ideations. People will think that you are strange and weird.
But I don't think I can forgive them for what they did.
I understand you're upset, but thinking about murder because someone betrayed you in a video game is not an appropriate reaction. It might be good to take a break from the game and calm down a bit.