The game doesn’t teach people how to drive and race in a safe and sportsmanlike manner.
Instead, players have to come up with their own internal code of ethics and unwritten rules in order to achieve success. This will naturally lead to differing opinions on what is “clean”, fun and fair as we are all unique individuals with our own mindsets and gameplay preferences.
When these differing mindsets come together online, there are going to be scenarios where one person’s way of having fun clashes with another’s.
This is not an easy problem to solve, especially when a title is in its post-release stage of life.
Games that have been built from the ground up to guide players towards a preferred style of play (Gran Turismo Sport) end up providing more enjoyable online experiences as the majority of players know what is expected of them and how they are rewarded/penalised for playing accordingly.
We can’t expect players to behave or conform to a preferred style of play when the game hasn’t told them what’s “right” and “wrong” in the first place.