Sigh. If you're going to be all technical, then note that many games have you make decidaions, which can teach you right from wrong. They also have consequences for negative actions teaching people that your negative actions have consequences. So in fact games do teach you decision making, consequences and stuff. Also, there is a ton of dialogue and parts in games that you have to read, so in fact, games teach you language arts as well.
Games aren't all about drawings and pictures, and you, my good friend, just got pwned.
Actually, NOT many games give you that freedom (of "decision" making, that is), they're linear. And even when they do, it's usually still scripted in a linear fashion.
As far as dialogue goes: In many games, dialogue is very straightforward. Now if maybe you were referring to Metal Gear strictly, you may have a point. But not all games are like Metal Gear now are they?
Maybe I'm being an elitist, but I haven't played many games that are truly thought provoking with their morals (and I've played many games).
But I will concede one thing: Games don't kill people. People kill people.