I only ever really take out my guitar when I'm miserable, which isn't necessarily a very good time to do it.
I don't particularly put myself in a bad place just so that I can write. It's not like that at all. I try to live a good life and some of the songs are reflective of that too. I certainly wouldn't describe a lot of the songs as being angry.
This weird thing that musicians have... it's got something to do with approval, and not feeling good enough, and therefore going out and being great somehow makes your life valid.