Not for everyone, no, but I do believe games can unintentionally cause harm on younger children's attitudes.
I'm not saying if some kid goes and plays Grand Theft Auto he'll go running outside with his parents gun and go shoot the nearest prostitute, but children do copy others. Their parents, their older brothers, wrestlers, whatever they think is cool (i.e. everything but teletubbies and Jonathan). Children for the most part are sheep. They could potentially copy a darker theme of a video game (i.e. setting something on fire) because they thought it was cool.
This doesn't make video games the causer of all evils, though. In fact, using my (probably Blue) logic, virtually everything is in a way harmful.