Isn't there a legitimate purpose for any action, otherwise one wouldn't act. What is an example of an illegitimate purpose? Is pissing someone off or causing emotional distress a legitimate purpose? May depend on what they've done to you, right? And if what they've done to you is a subjective standard, then who are we to determine whether the re-action was legitimate? Hmmm. I didn't mean to get philosophical but I think there's a point in there somewhere.