Sexuality
I truly believe that a person's sexuality is at the core of who they are. Obviously it's not the only factor, but it plays a huge part in molding someone into who they eventually become.
If circumcised as a child, I believe a person's development is forever changed. They won't be the same person they would've been had their bodies just been respected. I think this is especially true if the damage is more severe.
Sometimes you can just tell when a man is intact by his personality and that feeling he gives off. It's hard to explain, but it's a sort of underlying confidence that is night and day in contrast to a sexually mutilated male. I've successfully guessed many of my partner's circumcision status just based on the feeling they give off.
I know it's not just me that feels this way. I've spoken to intact men that claim they can feel "circumcised energy" much the same way.
Studies have been done that support my feelings on this... studies that show how brain development changes in a circumcised male and how other developmental issues arise.
After restoring and finally experiencing what real full body sexual pleasure is supposed to feel like, it has only solidified my feelings on this. Having never experienced it before, the pleasure is profound... life altering. It's clear to me now that it's absence could change a person and even lead them towards a certain path, like depression and substance abuse.