Griefing is Becoming More Commonplace Because Damage is Too High
People give up more and more often after falling 3 or more kills behind to their lane opponent or to the enemy jungle because the state of the game makes fighting back at that point incredibly difficult if not downright impossible.
The game is plagued, now more than ever, by this defeatist attitude and players just opening games is becoming far too frequent. And it is because the amount of damage offered to any one player who manages even a small lead enables them to detonate their targets in the blink of an eye.
And players have asked and asked and asked and asked for Riot to tone the damage down and to give players a chance to try and make up for mistakes made and to provide a chance for comebacks to happen so that two or more deaths does not generally seal ones fate. But Riot refuses to honor what it is that their player base, their customer base both wants and needs.
The only thing that continues to support this game is the overall addiction of this game.