I look around at people doing horrible things to each other, and sometimes wonder if they are "being true to themself". I think often they'd say they were - "Got to look after Number One", "Have to do your own thing" etc.

I don't actually think that is what being true to yourself means. I think it means finding out what sort of a decent person you are meant to be, and sticking to that, and not trying to be some other kind of decent person that you aren't meant to be.

Applied in musical terms that means, not just making a random racket for the sake of it, and for the sake of getting noticed, or spending all your effort trying to copy someone else, but rather finding what sort of music you have it in you to make, and working at that.