Shreeya, I agree with you. If you see a child in danger then I believe it is your responsibilty to take action. It doesn't matter if the parents are nearby doing nothing.

I regularly see young children wandering on the streets here. I get out of the car, take them by the hand and ring their doorbell. I insist that a parent comes out. I then explain that I nearly killed their child who was left to wander on the road.

I believe if you don't do anything to protect a child in danger then you are as bad as the parents who are not supervising their children.

'It Takes A Village' (Hilary Clinton) springs to mind.