In the area I live, the police, partly for political reasons, didn't keep young women safe from organised crime for decades. It was a national scandal and still is. So yes I'd like more stop and search, even now. But that's my area, not London, and so sorry for going off topic
Would you really like to live in a society where everyone is stopped and searched by the police, just in case?
Maybe one where people's faces are scanned continuously and checked against a database?
Then people can be detained, asked to move on and made to justify their presence - or denied something?
I wouldn't want to live in a society like that. I am sure you can see the potential issues that might come from that.
There are societies like that. There have been societies like that in the past. And people who the authorities didn't like got detained.