So, children have no fear because they are never exposed to any real dangers nowadays. If we are happy to treat our young people as beings to be protected then this would probably be a good state of affairs. If, however, we want to see them grow and develop with an understanding of risks, (how to live with them, manage them and avoid being dealt serious harm by them) then it quite patently is bad. Yes, it will probably result in our children visiting A&E more often, having more bumps, scrapes and kneefuls of gravel. No, this won't signify that we are bad and uncaring adults. You never know, it might even allow them to grow up with a greater streak of resilience than a lot of adults display nowadays.
Since homes seem to be some of the most dangerous places for children (they are more at risk from family members or other acquantances than from strangers) lets help them in lots of ways by allowing them outside, out of sight even. Arthur Ransome's heroes didn't mean to go to sea - the current generation of children will be lucky to even smell the beach through the car window at the rate we are going. Let's make some changes in our communities, maybe by trusting in a community first of all.
For all this though, we adults might need to tackle our own fears.