No, you haven't read it correctly, and I apologize for the lack of clarity in my remarks.
My argument is that violence is only needed as an outlet because some people (a smallish minority) are willing to use it on a discretionary to further their own ends.
I do not have omniscient knowledge of the causes and dynamics of violence. If it were possible to make a few thousand clones of myself and put them on an island with abundant resources (let's not worry about reproduction in this example), I can't say that violence would never break out because opinions would inevitably diverge in the light of my clones' diverse experiences, and if the differences of opinion proved irreconcilable then conflict could break out and violence might might ensue. Since we're talking about my clones arguments are virtually guaranteed :-)
tl;dr a nation of philosophers would not necessarily be peaceful under all circumstances, and I think you'd be foolish to attempt to engineer such a thing. I don't know with which aspects of my personality can be ascribed to genetics and which are a function of my upbringing or adult experience.