Why Not a Pro-Peace Vow?

I attended your talk tonight at Grace Cathedral in San Francisco. You may or may not remember, but as you were signing copies of Jesus I was the one who asked you why you don’t make it a “pro-peace” vow instead of a “non-violence” vow. Wouldn’t a “doing” action be better than a “not-doing” action? Additionally, wouldn’t such a vow potentially lead to an attachment? I very much enjoyed your talk tonight and look forward to learning more.