That too... not a very pleasant question. Probably an ambitious character wouldn't tie his new found powers (once he/she discovers them) with the crime she did.Pariah wrote: If I myself could potentially walk down the path of darkness as well, then I'd probably be worried more about where my new found powers are coming from...
Some boons are even difficult to notice. Think of a +2 bonus to bluff. A woman could spend her whole life and not notice that she is more seductive than she used to be before she killed her husband once he suspected she was seducing the young servant.
The same goes for penalties. The same woman could get a -2 to fortitude saves to avoid sexually transmitted diseases, or an increased chance to get pregnant with an unwanted child from her many lovers. She could spend her whole life thinking she is just very unlucky.
Still with boons that can be noticed easily, say ability to use charm person once per day... Questions would rise. Many evil people will ignore these questions in their ambitions but evil doesn't necessarily mean unwise.