How much surveillance is justifiable in the interest of preventing crime and terrorism?

In this day and age, there seems to be a lack of privacy. People are pulling out their phones recording everything even against people's consent in many cases. There are very few places left where there's 0 surveillance. How much is too much? Should we put laws in place to prevent people from recording others whenever they want?
How much surveillance is justifiable in the interest of preventing crime and terrorism?
How much surveillance is justifiable in the interest of preventing crime and terrorism?
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