I ran a Legend of the Five Rings many years back where the PCs all played Imperial Magistrates serving in Ryoko Owari, the City of Lies. As you might guess, Imperial Magistrates enforce Imperial law, and they're endowed with powers that that any fascist police officer would love to have. One of the PCs arrested a ronin samurai named Jaw and wanted to get some information from him. Jaw wouldn't talk, so the PC brought in a torturer and had him do his thing. The player of course isn't pro-torture. But he was playing a character in a setting where there was a designated torturer available for use, so he took advantage of it.
I started this thread because I was curious to see how many people were interested in roleplaying a character with fundamentally different values and outlook on life. Of course there's no right or wrong answer here, a preference is just a preference.