Junglers are a Toxic Role
Riot should seriously consider removing Junglers from the game. They are problematic and generally lead to an un-fun experience. Furthermore, they undermine a sense of fair play and honour in the game.
The whole point of the role is to ruin 1 vs 1s and true tests of skills in the lane. Having people lose lanes suddenly because it turned into a 2 vs 1 is not cool. Its not fair sportsmanship. Imagine a Trial by Combat where suddenly an archer entered and shot one of the 2 combatants, giving a sudden free win to the other contestant.
The whole Jungler playstyle is stealthy, sneaky, and cheap. Junglers ACTIVELY try to undermine other people's lanes and/or try to sneak into the other Jungler's camp and ruin their game experience.
Its become a meme that when a Plat/Diamond goes surfing in a lower elo as JG they will deliberately hunt down the other Jungler, make it impossible for them to farm at all, and just wait and kill them over and over. This in turn leads to the other team flaming each other and collapsing while the victim's protests that its not his fault fall on deaf ears. Though to be fair, its hard to be sympathetic since they chose to play JG too (and they were planning to ruin other people's lanes if allowed to... its kind of like a Joffrey killed Ramsay unfairly type of thing, hard to really feel sympathetic either way). When this happens, you can't help but feel its a bit unfair. If a Plat destroys a Silver in lane in a open and fair contest, then that's cool and we can learn from that. But there's just something really unsavoury about hiding in a bush and jumping on people over and over and over...