Based on what I've seen, Bronze players have a better mentality than Silver players
In Bronze people see one guy that looks like he knows what he's doing and say "fuck it ill follow him". While in SIlver, most players think they have to be the star of the show. They have to be the team leader, they have to be carrying, they have to be calling the shots, etc. And then when things go bad they troll, rage, and/or afk. How does going from bronze 1 to silver 5 give people this big of an ego?