I so wanted to knock somebody out today

Rory and I had to go to Sears, so we went out into the mall to let Colleen ride this little bus ride she likes. On our way back to Sears I saw this young man pushing a stroller in our direction. In the stroller was a baby girl I would guess about 10 to 12 months old. She wasn't buckled and she started sliding down underneath the cup tray on the stroller. I started to speed up my pace to get close enough to get his attention. By the time I got in distance she had slid under the tray and was falling out of the stroller. I was trying to get his attention and he looked up and saw me pointing at his kid. If he took one more step he would have pushed the stroller onto her. So, he walked around and picked her up off the ground and I thought he was going to see if she was ok, but instead he smacked her bare leg pretty hard and tossed the screaming baby back into the stroller. I couldn't believed what I had just saw. When he did it I gasped and stood there with my mouth open out of shock. I couldn't move. This poor baby that had just fell out of the stroller because her parent didn't buckle her up got a spanking on her bare leg. A baby I mind you. A little baby!!! Rory saw the look on my face and had me start walking again. I think he was afraid of what I was going to do next. I was so mad!!! Well, once the initial shocked passed I was sooo mad!!! I don't believe in violence, but I wish I could have knocked his lights out. That is probably the wrong approach, but that his how his actions made me feel. I am so sad for that poor little baby girl.