The concept is this:
The family wants to enjoy games that don't involve blowing things up or causing harm to symbolic creatures or symbolic living things. What's wrong with that? It doesn't matter that it's an Atari 2600 - conceptually games where you kill things don't exactly bring out the best in children. Children don't know better.
Some reponses to what I've read:
Kaboom - You are not creating bombs you are stopping them from going off.
Frogger - Yes, frogs die - but only if you are not good enough.
Asteroids - Shooting the asteroids - but what about the UFO's?
Space Invaders - Where's the diplomacy?
I know this seems a bit weird to most people. But seriosly, why all the wise crack comments for people who just want violentless video games?
PS: I really like the comment about eating the sheets off the ghosts