Why Turn Left to Turn Right?

Why is it some people have to swerve to their left to make a right turn?  It seems crazy, illogical and just reeks of complete lack of driving skill.

Instead of swerving to your left to make your right turn, just pull another foot or two up before turning-to-the-right.  That way, you're not terrifying oncoming traffic or bicyclists trying to pass you.

Eesh!!  Just trying to be helpful here!