In the UK it has worked at other places

"He said 103 arrests has been made so far and there was one false alert which did not result in an arrest.

Supt Luke Dillon said overall crime figures in the Fairfield ward, where the pilot has been held, fell by 12% per cent.

"We're seeing reductions in almost all crime types, certainly in shoplifting and robbery," he said. "

https://www.bbc.co.uk/news/articles/c2056r07rjlo

If it's not working it's because there isn't enough of it, silly.

"Last month BTP announced it was extending the trial for a further four months and expanding the deployments to include London Underground stations. "

The surveillance will continue until morale improves ... or collapses, depending on your perspective.

No, because think of the children. /s