So we went to a kids party on the weekend and the birthday child and two of her friends (she was 5, other kids 6 and 5) were playing 5 minutes from the house on the sea wall.
You couldn't see them from the house and her Dad said "she spends hours at a time down there, it's great she can have the freedom."
I hate being that judgey parent but was so surprised I said "my God do you think that's safe?!" and had the two parents (very gently and nicely) lecturing me on how kids need freedom and I needed to loosen up when ds (3.5) got a little older.
A number of things could have happened to her. She could slip (good 10 foot drop) and smash her head, she call fall in the ocean and drown, or god forbid somebody could take her. It's a a very naice seaside town but still, it can happen anywhere.
I really wasn't being unreasonable in thinking a 5 year old shouldn't be playing out alone for hours at a time was I?! I know you can never eliminate all risk but 5 seems so young! Dh is so fucking laid back he was all "oh I don't know, each to their own." 
And now they all think I'm some weird, ott, helicopter Mum. 