The point that people are trying to make is not that surveillance itself needs to be banned. I think any reasonable person can see that there are circumstances

The point that people are trying to make is not that surveillance itself needs to be banned. I think any reasonable person can see that there are circumstances where it's necessary. The issue is specifically with backdooring encryption to enable surveillance. You're basically describing some magical fantasy land where the ability to utilize the backdoor could be restricted to "genuine police work" by the legal system. Here in reality, we have to acknowledge that it's impossible to do that.