I think one of the points that isn't often discussed is should we have no go areas? Should we, as hopefully law abiding citizens, need to feel that we can't walk through the park at night. I know when my daughter was a student I would tell her to be careful walking home late at night by herself, "stay with your friends, look out for each other, get a taxi if you're worried about the money I'll send you some." You know the sort of talk and yet at the same time I think that we should reclaim out streets.
As a kid in a rough inner city area I played out, went out after dark, learned to deal with kerb crawlers by the time I was 11. It wasn't unusual, the streets were busy, kids walked home from school alone because the streets would be full of other kids walking home with the occasional mum with a younger child. If I look at the road where I live, with a large primary at the top of the road, I don't see any unaccompanied children and yet I live in a nice area, a low crime area and there is probably alot less risk than where I lived in the 50s except that a child walking home will be walking home alone.
On individual cases I absolutely believe we should keep ourselves safe, as a society I believe we should reclaim our public spaces and I honestly don't know how we can do both.