good guys and bad guys

As we all know, good guys have blue light sabers and bad guys have red light sabers. Except for Mace Windu, who has a purple light saber, apparently for no other reason than that Samuel L. Jackson thought it would be cool. (Allegedly, Windu's saber handle says BMF on it, echoing the letters on the wallet of Jules, his character in Pulp Fiction.

So every time my son starts blathering about good guys and bad guys, I blather back about how in real life no one is all good or all bad. People just make good or bad choices. Am I the only parent who does this? Is it doing any good? Am I taking all the fun out of it? Am I just flapping my jaws to no effect at all, either way? I tend to think the last, but I retain a faint hope that my blathering will make it less likely that my son will grow up to not bloviate about "evildoers" or say things like, "If you're not with us, you're against us."