The question is do you want serious criminals including financial criminals, and whatever authoritarian government shows up at some point and starts tearing up the already increasingly authoritarian UK rule book (hi America) to have access to all communications? Do you want to protect stuff like online shopping? What about https, that protects the sniffing of data in transit across the internet, so a huge chunk of online privacy?

You don’t get one without the other.

It must be said that personal privacy is a cornerstone of a civilised society. You either ahve that or you don’t.