Totally agree with your security theatre point, even all of this does nothing. However, to keep in mind with the police, they must have a reasonable suspicion

Totally agree with your security theatre point, even all of this does nothing. However, to keep in mind with the police, they must have a reasonable suspicion in order to search your person. They cannot simply stop everyone walking down the street and frisk them. And pretty much anything that the police do to you can be challenged in a court (obv whether you win is another thing, but the recourse is there). I think drawing parallels to (traditional) law enforcement practices is misleading.