win-winresources, I never said that I would put my hands on another person's child.
I have in fact, had an eight-year old child threaten to kill me and my daughter at a local playground because he said that we needed to ask his permission to get on the slide. Am I supposed to ignore this and not tell anyone? What happens when this child threatens someone in school? The teacher and the other students involved are not going to ignore it either.
I also had a situation where I took my child to a local park. Little children were running around, threatening each other, screaming, pushing each other, and using inappropriate language. I thought about just leaving, but I had every right to be in that public place too. So, I did say something. I asked where their parents were (no where to be found-fourteen year old girl in charge), I told them that I did not appreciate hearing their caustic language, and I did not want my child to think their behavior was appropriate. They left, and it was better for all of us. I could enjoy my time with my family. Another person came over and said she was happy that I said something because she was ready to leave and was afraid to say anything.
As for disciplining my child, I actually appreciate if another child or adult sees or hears my child doing something wrong and tells me. I am the one who disciplines; I don't expect someone else to do that part for me, nor would I want them to.