I think this is a guy thing, I really do. Women who train in martial arts don't so often seem to feel the need to constantly grasp for a justification for what they're doing.
HA HA HA HA HA HA!!!!! You hit the nail on the head Mary!!! Most "guys" don't even know that this "self justfication" is a part of thier subconcious biology...If you're not the biggest chest thumping plumage wearing peacock on the block or the last ram standing after locking horns all day you're not getting noticed by the girls...
One of the many themes of Aikido I love is to channel this pontentially destructive male energy into something postive and productive in "nature" and not to suffer the trap of agression, escalation, and violence.
On a side note it seems that most every male student (including me) goes through a period of black belt-itis where thier technical acumen blinds them to Aikido's "spritual" purpose...Don't get me wrong but most of the Gendai Arts seem to have this "phase of development"