To have never worried for a second about the possibility of my children being abducted...

[curlew]

......and to have never, as far as I can remember, made any decisions based on the possibility or factored it in to any plans I have made or actions I have taken?

Is this unusual? Do most people worry about this?

The getting lost bit is in response to curlew's point about people being afraid to assist a lost child.

I have been on a thread on MN, where loads of people admitted to watching toddlers who appeared to have been separated from parents, in case they needed to dive in and help. It was heart-warming, actually.

I think it is selfish of parents if they don't allow their DC to do some things because they (the parents) would worry. To save themselves some worry, their DC miss out on a bit of independence, and I think that's unfair.