If we want an argument about Sith, it's pretty easy. They take the easy way to power. Wanton destruction is a lot easier than self-restraint, and they have no qualms about destroying property or bystanders when it's time to be violent. We could also assume that Sith spend time honing their saber skills instead of learning the finer points of inter-stellar diplomacy.

But, seriously. Bad Guys (tm) have to be intimidating. I wasn't trying to be a jerk about it. Punctuation and NM posts tend to get interpreted that way, though.