Beswitched, your story about the elderly man patting a child's head is exactly the kind of thing that many of us would do as a natural human instinct. Nothing sinister, or inappropriate about it. And, anyone who thinks there is, well I'm sorry, but I think they have issues. Just my opinion, of course, and we're all entitled to our own opinions.
Good grief, no one is trying to silence mothers, and no one is saying they don't have the choice to do whatever they feel is right for them and their child. I was certainly never made to feel that way when I had my own children, so I'm surprised that things are so different now. We all bring up our children in a way that we see fit, and if you don't want anyone touching/interacting with your child then that's your choice. But, natural human instinct is just that ... natural. If I were to see a child step into the road, I'd run and grab it. If I were to see a child drop it's toy, I'd pick it up and hand it back. If a baby/child sitting in its buggy was to hold out its little hand to me, I'd give it a little touch and say hello. So sorry if that's deemed as being inappropriate to some mothers ... to me, it's simply a natural human instinct.
As Beswitched said in the OP, she wasn't referring to randon strangers picking up a child, or kissing/cuddling it. That, of course, is something entirely different.
I guess we all need to be more aware of differing views. No one view is right or wrong.