Why people care so much about victory?

I mean if you know you did good and the lose was not because of you why you get so mad....you can't control what others do...i mean that percent where you make the difference is enough to climb. I finish last season Plat 4 and lose a lot of easy games till I got there, in some I did extraordinary and still lose - cause few or more games just cant be won and when I see people get so angry to wish the other players do die - I don't know, is just stupid or we are really evil creatures.
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