Maybe it is about shifting the blame. If something happens outside, it's the police failure but if something happens inside it is venue management failure.
Anyway, I completely agree that we have given up way too much in the name of security. If it's not the terrorist, then it is "think of the children" scare and we are about to get our personal devices scanning our personal files and report us to the authorities. For now it is CSAM material but I don't see any reason why the same devices wouldn't be scanning for other stuff once the system is in place.
I totally expect our devices to start checking on us for "betrayal" patterns once the conflict with China intensifies, for example. Once you become a "human resource" and nothing more in the eyes of the political structures, you will need to be managed and in 2020s the tools for it are plenty and powerful.