I am not sure what freedoms were fought for that would be affected by monitoring communications.
Though we all use the internet, so we are constantly monitored anyway. By Google who then can aim advertising at us. Most of us shop in Sup[supermarkets, Tesco Club card points, a way of giving you something for nothing? Is it hell, its a way of monitoring what you buy so they can push other products at you.
You drive anywhere and you'll hit ANPR cameras.
You already leave a huge footprint where ever you go anyway, although the holders of that information are businesses, not Government. Not sure I'd trust Tesco's more than I'd trust MI5!
What the security services want is to be able to look at triggers in communications, that currently they don't know about. If you are doing nothing wrong, you wont trigger any interest and even if you do, you'd soon be rowed out.
The bigger question here which everyone avoids is whats most important, a 'hand won freedom', that doesn't really exist and was never fought for, or innocent peoples right to be protected against terrorism.
Some clearly think thats a hard decision. For me it's not. The Security Services/GCHQ can hold whatever they like about me, it really makes no difference to my life at all.
Like Richardoforce, I lived in a Country where an ID card was compulsory, although we issued our own. I also worked in a job where I was required to carry an ID card all the time. It's hardly an issue, unless you want to make it one, and even then most issues are unfounded.