I agree there are limits. And I have no problems with government cracking down on (suspected) criminals.
What I do have a problem with, and which has been in the news several times in the past years, is government agencies illegally listening in on many private conversations (the so called drag-net approach).
This.
Privacy invasion, such as searching someone's home or devices or monitoring their communications or financial activities, is entirely justified if there is reasonable evidence to suspect that person of a non-victimless crime. However, such cases account for probably <1% of privacy invasion which takes place under the direction of governments and their associated agencies. What absolutely is not justified is the blanket surveillance of entire populations and countries, the wire tapping, the banning of end to end encryption, the government backdoors in to your devices and software, and all the other shocking revelations which have come from and since Snowden.
There is no evidence that such blanket surveillance has prevented terrorist attacks or any of the other things that governments claim. Its goal is population control, not crime prevention. It is never justified and it should be resisted.
And history shows that the mere existence of a mass surveillance apparatus, regardless of how it is used, is in itself sufficient to stifle dissent. A citizenry that is aware of always being watched quickly becomes a compliant and fearful one.