PSA: Dont Play League of Legends as if it were Call of Duty.
It isnt about kills.
It is about objectives.
Think strategy.
Not running around for kills.
In Normal, go ahead, but in RANKED DONT CHASE or get greedy.
There is a difference between greed or stupidity, and initiative.
Initiative, you see an opponent get caught out, you pounce on him/her.
Greed, you go in 1v1, get baited and turns into a 1v2 or 1v3, then you get shutdown.
Initiative, you see inhib down, you go other lanes or get drag.
Greed, you rush that lane w/ no inhib, waste time or waste baron buff.
So please, think of the bigger picture. Not about your KDA.