Griefing in URF

Some champs just need to be removed or toned way down in URF. Simply because in the hands of several people, they take their 500% advantage and just keep everyone hostage in a game while they farm kills over and over and over. Predator Rammus or Malphite for example. I get the mode. I get that some champs have strong advantages. What I don't get is why Riot is okay with leaving some elements totally alone knowing--you have to know--that people will abuse it. If you're not trying to win the game, especially when you could so do in 5mins based on comp or champ alone, and instead just look to spam snipe everyone on the other team so you can feel good, that should be considered foul play.
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