That's quite an incentive to prevent her from 'starting shit'.

It really isn't. Women engage in violence by proxy, by manipulating men into doing it for them. They've been doing it for all of human history.

Whether the fight is over a woman directly, or about something she said or did, the fact is that women are the cause of most fights between men. That doesn't absolve the men of responsibility, but women also bear responsibility, and this behaviour occurs so often because they are almost never held directly accountable for it.