So 1984 style listening devices and cameras in every home is the obvious solution right? Houses are where a lot of abuse happens. Scanning doesn’t even stop abuse from happening, just the possession and distribution of it.
Most people aren’t doing crimes. Roads are used to traffic drugs but we don’t hold the state accountable nor do we setup checkpoints within country to inspect cars for illegal material because some % of cars do.
If your point is that privacy advocates aren’t considering the negative aspects of technology I’m sure they have but see these efforts as a reach towards more state surveillance.