The overwhelmingly common reason as to why career Bronze players are in Bronze in the first place is because of one of three factors.

1. They are stubborn. They get to where they are by being hard-headed about everything, be it pointless or game-changing. It usually pertains to what they do with champion builds or strategies, and informing them that their angle of attack is poor is not worth the time or effort, as they do little more to inform you that you are wrong in every way imaginable.

2. They have no awareness. Bronze junglers are the worst about this, as they get themselves killed invading very often, even if they have gotten proficient at invading enemy camps. Otherwise, laners and supports have little self-awareness and cognition of the mini-map to begin with, and it is only compounded with utter absences of friendly wards to make for a poor control of the map.

3. They are largely trolls. Many people who AFK right at the start of the game are very likely to be smurfs whose main purpose is to throw ranked games for players attempting to promo, and they are very good at it when they are able to look up live game stats and recognize summoners who are in such a position. If you do not report summoners who troll, you will likely encounter them in other matches and you will only extend your stay in Elo Hell or just Bronze in geenral if you do not take action.