Developing characters is a collective process, on one hand; it's an individual process on the other. The truth is rarely pure and never simple, as dear Oscar Wilde would say. A great of it, of course, is, you collect as much information as you can and then you put it into the mulberry of your mind and hope that you come up with a decent wine. Sometimes you do; sometimes you don't.
I feel we live in the kind of culture now where you have to be very smart to navigate the right way, and I just don't have those smarts. I think with age and time it will change, but I can't obsess about it.