system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] Are all sith "evil" or Darth Sidious and his followers were just shitty people who happened to be sith?
gpt
The Dark and the Light sides are simply divided by their practitioners' adherence to certain emotions. Where Dark Siders draw from raw emotion: Jealousy, Anger, Fear, etc. Light Siders draw from higher feelings like Patience, Compassion, Mercy.

While one may follow the Dark Side and be "good" (for instance, passionate love is the domain of the Dark Side and that's not necessarily bad), the power drawn from the Dark Side is drawn in large part from very selfish feelings. The greedy, aggressive and megalomaniacal are the strongest in the Dark Side, so those are the ones who managed to become Sith Lords.

TL;DR - Sith are dicks because Sith are powerful in the Dark Side and the Dark Side's power mostly comes from being a dick. However, not all who use the Dark Side are necessarily dicks.