Care to explain why you're not against it? I haven't found a single reason, which justifies to tap on a full comms link of a whole network. Not a single one.
/s
I also wouldn't mind seeing some stats, that surveillance is an effective tool against the threats you listed.
But even in this quote the weasel word "essential" is included in the term "essential Liberty". So what is absolutely essential? Could there be legitimate disagreements on that?