Wait, wait. Mitch -doesn't rape someone- and that makes him a gentleman? C'mon. That's a pretty low bar for "gentleman" isn't it? That word has a specific meaning and it is for sure not "doesn't commit a horrible, violent crime even though he wants to."
I think the wording you're looking for there is something other than "fundamental gentlemanliness." There is a whole lot of daylight between simply not being a violent criminal and being a gentleman.