We will have to agree to disagre on this one. The analogy does not stand imho- as a peadophile can't stand in a crowd and press on a button and spread peadophilia all round. And having to take shoes, jacket and belt off, and accept to be frisked, is hardly a real inconvenience- but stopping you from flying would. Should be stop single people flying?
What truly concerns me is a/ the disproportionality of the response - children are accompanied by parents or other adult in loco parentis, and are not reall at risk in a public place and b/ because if THIS park can do it, it may soon spread to other amusement parks, city parks, gardens, swimming pools, etc, etc, etc - and become 'the norm' in the UK. Which I believe would be tragic. We certainly do have to be aware and vigilant, but we can't stop all singles leading a normal life, just in case, surely.
It is discriminatory in the extreme, and should not be allowed.