It hurts me a bit to make my characters be mean (and I don't mean really 
really  mean, I just mean stupid arguments and stuff....I'm a softie), because they're quite real to me most of the time. 
 
 Sometimes I have to create a character with the specific purpose of being a bad guy, and then I also have to force myself to make him bad enough to be realistic. LOL (Same method I use when killing off characters - because I don't want my characters to die, I have to create specific characters for the purpose of killing them off because then I am not emotionally attached to them. It's a little strange....) 
As to what I read/watch: 
This is why I don't like buying books before I can read them at the library. I prefer things to be implied or offscreen. Sometimes you can make your bad guy seem worse by implying things - worse than actually showing what he does. 
For example, in the original Star Wars trilogy (the ones from the 70's and 80's), you don't see most of the oppression that apparently the Empire participates in. You don't see the active violence of the stormtroopers actually killing anyone 'cause they're lousy shots onscreen, but deadly offscreen. 

 You don't even see more than about three seconds of the two torture scenes in the trilogy (and some films would, you know...). You don't need to. Everything is implied because of the way characters act and react. 
Another example from the same films is Darth Vader - he doesn't do a ton of active violence either. The things that make us concerned about him whenever he walks on the screen are (1) visuals (his black metallic costume) (2) SFX (his breathing) (3) the respect other characters give him. (And during episode 5, also because he keeps killing off his officers in an unconventional manner.) 
Another example: in Narnia (LWW) we don't see the capture of Tumnus and subsequent apparent torture - we only see the aftermath (statues and a banged up face). In the battle sequences, there is no blood, but to get across the horror of war, heroic characters are wounded or fall in battle (gryphons, Orieus, Edmund) to the shock of Peter. 
That's all in the violence direction - I know there are ways to imply the other 'big' stuff but I don't write/watch things that need to! 

 (Fantasy doesn't usually deal with anything but violence.) 
Oh, and on foul language - I really hate it when Christian writers use it. I see other ways of making my bad guys seem bad (see Darth Vader, above ^^), and I wouldn't write anything that I wouldn't want my siblings to read...
(...I wish I had my own copy of the Space Trilogy so I could take a black marker to the language and enjoy the sci-fi allegory much more...) 
ON THE OTHER HAND--
I have heard it said that some people need a good kick in the pants to wake them up, and a book or film that tells it exactly as it is can do that. 
Just don't ask me to read or write said book.... 
