Kids use buses, roads, footpaths, shops, trains, planes, cafes, restaurants, libraries, housing estates, toilets, launderettes, ferries, post offices etc etc ...

so do alcoholics, drug addicts, the mentally ill, people who have just completed sentences for murder, manslaughter, theft, violence, paedophilia, rape, drunk driving, etc etc ...

there is a risk in all these places from all these people.

I'd rather that a paedophile was reading a library book in public than on the internet in private ...

In fact (whimsically) perhaps they should be made to hang out in libraries where they can be more easily monitored.

The answer in my opinion is that when you take your child anywhere you must look after them properly and I'd be more careful at a bus stop.