Exactly FF...you don't hit out of anger...but sometimes its necessary when you're raising a child. Sorry if it offends anyone, but I collectively have 23 years of child raising experience. Sometimes the "counting to 10 method" and "time out" method" just don't work. I think you do the child a service by establishing the rules early on.
The best discipline I ever learned in my life was in boot camp with the Marine Corps. I am by no means a robot or subserviant to anyone...but the experience taught me how to follow direction of those superior to me and with more knowledge than me when appropriate. And the result of that experience was that it taught me how to be a good leader when appropriate.
Oh shit...I'm on a tangent...isn't this a BDSM site???