Poor afk punishment system

Why should I wait 5 minutes to play a game of league? Riots afk punishment system is unfair to some degree, in my opinion. The rundown is that I had charger issues and instead of making matters worse with a 12% battery life, I simply went to base and fixed the problem before it got worse. This took maybe 3 minutes. I then got back into the game and it was followed by 900 ping for maybe 10 seconds and packet loss for about a minute, give or take. Sure I didn't go balls to the wall with poor connection, I stayed safe, just wasn't fully functional for about 5 or 6 minutes. Our top laner proceeded to flame me saying "you don't deserve to play league" and "you are terrible" and what not. My question is, why that I never afk, disconnect, rage quit, or leave, gets low priority, but the person flaming for such a small reason doesn't get banned or even any punishment at all, but one report says that I need to wait 5 minutes to play? Yes this is a minuscule problem and probably not worth anyone's time, but it's just irritating, because I have to wait 5 minutes just to play, and if the game goes bad, it wasn't worth the ridiculous wait in the slightest, and god forbid you do it again, because the time to wait to play only gets worse eventually causing you not give a shit any more. TLDR: is this punishment sytem right or wrong because if it's right I'd like to know how it's right