An unfashionable view perhaps, but within reason, pedestrians should be free to wander as they like (if memory serves, they have absolute priority among all road users, a priority that is already shamefully abrogated by the hostility and entitlement of motorists). When I cycled through Rusholme (a hotbed for young people afoot whose minds are on other things) I slowed right down, and kept an eye on them. I managed not to hit any of them in 7 years of daily commutes taking in shared paths and roadside cyclelanes into which they would, occasionally, venture.
We don't improve Britain's hostile, selfish road culture by being hostile and selfish ourselves.