The fundamental difference between a once and done, and a multiple time offender.
There is a large gap between being a person who breaks a rule once, and doesn't do it again (for a while at least) and someone who does it consistently. If you leave one game every few months early, for a reason like say... forgetting that you needed to pick your grandmother up from the airport and starting a game, having to leave about twenty five minutes in. Or snapping at an overly toxic player once, because everyone has their mental limits. These are issues yes, but they happen few and far between. And generally the rule breaker is upset that they did wrong and try not to do it again. Then there are people who consistently break the rules. Those who constantly vocally abuse team members, or leaving games early all the time. These people are the ones who are the biggest problems, and they also happen to be the ones who get the most upset when their inevitable ban comes in. People complain about Riot's report system, as it is all automatic and doesn't actually feel like a real person is trying to solve these toxicity problems. But we should be thankful that it only punishes those who break rules multiple times, and those who break rules every once in a while. Thank you for listening, and have fun out there.