I'm not sure what you mean by rules of league. As far as I know there aren't a set of rules or by laws, and the closest to it would be meta that is generally followed bc it tends to win more than other strategies. However, that would be before the game starts, and you're talking in game so I'm not sure what you mean.
Other than that I'd advise you to consider how you're "trying to educate them" when you're in game. Depending on how you do this it may cause more problems than it solves. Being overly critical when people aren't looking for advice tends to put people on tilt and not gain an advantage, while offering advice if it is needed, and adapting your own strategy if it is not, is a stronger option in general. I've had teams where the team continually was grouping for team fights even though the team was behind, and instead of backing off and poking or stalling to farm up and fight evenly, they just kept trying to fight when we were at a disadvantage. I've left my team to die in a 4v5 across the map (because we would lose the 5v5 anyway) when I've been in these games and had a good wave on the other side. At least a half dozen games I've done this and pulled down two towers and an inhib, while my team was pinging me to back and come help them fight over the second dragon when each team had 1. An inhib down in bronze/silver MMR games at 20-25 minutes usually lets you get a lot of other stuff bc people send too many people to deal w/ super minions and you can dive them if they defend the towers.
Lastly, I'll add that in my experience at least, there are a lot of games I'm proud of because I had strong cs and very few kills but a ton of pressure across map by split pushing, or taking dragon or something while teams are chasing each other through the jungle. I've also played a few games (not many, because I usually die more times if I lose by trying to bring my team back in the game and getting myself killed) where I have high kill counts and low deaths, and generally if the team lost it's my fault. If I'm really fed and play well, I almost never lose. Sometimes we throw when the team goes to fight a bad initiation from a tank, but even then half the time if I die I could have lived and defended instead, and maybe won when my team came back up. Most often though if I get fed and lose, it's bc I didn't roam or take objectives, so my lead didn't become my team's lead, or I made a really big mistake late game (face checking a bush, trying to engage and using gap closers that my team couldn't follow fast enough, or just some other error that gets me killed for free when I didn't have to die) and the enemy team ended he game because of it. I think that's part of the problem w/ having a ranked system that isn't tied to wins and losses. There are a lot of skills that are harder to quantify and it's difficult to score them for a ranking system, but they are reflected to some degree in the ability to win an average game.
