Why are kayn players always so greedy

So why are kayn players always so greedy. I have played to games in a row now and i have gotten a kayn on my team both times. I cant understand there thinking the are allways trying to go in 1 v 5 even if you ping or tell them not to. They dont even care. They try one time and die and then buy some items and try again. So pls can someone tell me why.
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