I am in two minds over this: of course mass surveillance of (mostly innocent) people is worrying and conceptually goes against the ideal of a free society. However, stopping it completely is going to make the TLAs task of protecting us from the ever-present danger of bad actors, whether they are rational/irrational harder, maybe to a significant degree. Those who complain about surveillance are probably going to be first in the blame queue if/when something bad happens and those in charge were unaware of the risk.
I do not agree with many Western Govts stance on encryption as backdoors for the few is in reality backdoors for the many. Using intelligence and metadata is fair game, IMO.
Realistically, some parts of some agencies pretty much have to be able to operate outside the law on occasion, for the greater good, but not without oversight. You cannot get warrants for everything and, as above, if something is missed or overlooked, everyone complains about it. Unknown unknowns, etc.
One of the main issues is that once you give permission for these kind of things on a strict need basis, there inevitably follows on a sort of mission creep where it does not stop until you know the whereabouts and thought patterns of every human that exists. How to combine the need for extra-judicial operations with strict oversight is a question that keeps many well-meaning officials up at night, I hope...