"if a child (or adults) welfare is potentially at risk then I'm sorry if it offends you - but yes I do consider it my business."
Actually you don't. What you enjoy is the power of being able to decide what's best for other people and more than anything else the power to viciously punish them if they don't do as you say.
It's got nothing to do with concern for their welfare. If you were concerned for them or their kids, you'd talk to them. But you don't do that, you want to wreck their lives and families instead. Anyone can see that doesn't help, it just makes the situation worse.
It's all about power. I don't know you so I can't see where your need to abuse and control others comes from. I doubt you were abused as a child yourself, very few such cases actually stem from that. It's much more likely that you're just a bit of a failure - I suspect that having kids has been the pinnacle of your achievements and you subconciously resent the fact that other people have done that and so, so much more, so you try to hurt them for it.
Perhaps you should get help instead of pretending to help?