If role models didn't affect kids behaviour there would be no swearing or bad behaviour.
I don't know many parents that teach their kid to swear or disrespect their elders or commit crime. They learn it partly through necessity in the crime example and partly through following others.
In the same way and reason that cigarette advertising is limited, if kids see a perceived "cool" figure doing something outside the norm, they will be tempted to emulate it, to become equally as cool.
It's not a matter of whether a parent teaches them right or wrong, though clearly that is 90%. Outside influences need to be understood too.
Accepting a rapist back in to a football club damages the community as a whole, unless there are measures to show how wrong that was and how damaging it has been for the player.
Bringing players in like that doesn't have to be a bad thing if handled correctly, but if the issue is ignored it will definitely affect people, and not only kids.