What's good is good, what's bad is bad. If noone's mad then all are glad.
Getting angry or sad over a video game is fine. It shows that you care about the game to some extent. There is nothing wrong with this. But in either case you should always take some a break for a few hours, or maybe a day, as the saying "It's only a game." does hold merit in that what happens is unlikely to affect you in the next session, unless it happens to be something RP-based, in which case keep being mad/sad/glad/what have you.
Validhunting is bad. Winning isn't bad, but winning tends to be dictated by the goals of those who try to win. Surviving is a good goal, making RP is a good goal, these things make sense and work well together. Validhunting is not a good goal, it may be fun but it can also be something of a cunt move and it neither prioritizes your survival or RP.