Recreating the experience of, say, bereavement in my own head is pretty rough. I was used to switching off from emotions every day of my working life as a journalist, but in fiction, you have to feel it 100%, or else it's a flat experience for the reader.
My books deliberately provide no answers or messages. I'm drilled in the habit of objectivity and also aware that the steady drip of fiction has more power than facts to shape opinion, so I handle it with caution.
Whether I build a character from the ground up or develop one, whether within my own copyright or in licensed work, I can step into that character's mind. It takes a kind of voluntary dissociation akin to method acting, military planning, marketing, or detective work: to think like the other guy and work out what he's going to do next.
Characters have changed my mind about some very fundamental moral issues, and that's the real satisfaction in the way I write - the ultimate learning experience.
Writing is like a rollercoaster ride for me, an adventure. I love exploring the world through 'playing' people who are absolutely nothing like me.