Let’s find this man! Wanted in UK

Few days ago there was a TV transmission from event in Sheffield Theatre in England. The camera man knew his task, during the live footage he has filmed the man disturbing actions on the child next to him. Now entire social media force is on a search mission. The tv channel that has aired this footage received tones of complaints, the matter has been passed on to Police. Should that not be easy task?
This was an event, where each person has a ticket, to purchase a ticket you definitely need a card or verification through online purchase, like billing details, there are cctv all over the place. It should take no longer than few hours to find that individual! Yet nobody does anything, social media warriors are the only hope here.