I think i might understand why players seem more toxic now than before.

If theres one design flaw in league that is prevalent in every game its the speed of the risk reward factor. If you make a risk you arent actually trying to put more of yourself into the risk or deciding to back out you are simply going in hard and trying to win. Since you dont really feel like your risk are being rewarded as they either work or they dont you dont feel like you had the impact on your skill. As such since you dont feel like you had impact on your gameplay you end up getting 2 options: either it didnt work or it did.

In short the major design flaw is not that the game is bad its the game doesnt give you the opportunity to play it in the first place. Which is why some players actually say they are only having fun if they win.