Am I a really bad, awful person?

No, it isn't awful of you. You aren't sick, nor are you doomed to eternal damnation. There is a difference between finding a person physically attractive, and finding their actions appealling. You find him to be good looking, but do not condone his actions. I must correct you on a minor thing. Breivik is a m murderer, not a serial killer. The difference is that m murderers usually commit multiple murders over a short period of time; e.g. a day. M murderers like Hitler, or Pol Pot, who committed m murders of a period of several years, are usually called genocidal m murderers. A serial killer, on the other hand, kills multiple people over a series of weeks, months, years. They are called serial killers because the killings occur once a week, or every month, just a TV "serial".