I honestly think thats completely fair.
But what about if you didnt see them do it, if you never even knew that anyone had taken a picture - obviously as you dont know you wouldnt care, but ignore that minor fact, and tell me if you think that it would be a problem for you?
And knowing that people can, and do take pics of others in public places like that, would you refrain from going to the park again to safeguard yourself from it?
Why would you delete at the request of an ordinary member of the public perfectly reasonable and legal photographs that you'd taken openly in a public place?

If you have concerns in that area I think the amount of CCTV cameras in the UK would be a more realistic concern than the comparatively minuscule number of photographers doing candid street shots.
I'm honestly trying to keep this on topic and not rise to the bait that a few members are throwing at me, I haven't returned any of the numerous insults, nor been rude in this thread to anyone - so can that please be the end of it.
and no, todd flanders, who raised the issue, hasnt attacked you in this thread either. i also dont think you'll see many people here objecting to candids of children as long as permission is given from the parents. theres a whole world of difference is doing that and using children for your own gains, without permission. because thats what it boils down to isnt it? your gains. that, and parents being naturally protective of their children. and who is a photographer to go against their wishes and use photos of their children?