Your assertion that criminals are idiots or lazy might hold true in the case of the high school weed dealer but i'd argue strongly against that case for the international drug trade or traffickers. The more sophisticated the crime, usually the more money, the more incentive to keep it hidden. These laws aren't written about weed dealers, they're written about traffickers. The justifications are always the high level traffickers and related peoples, the people most likely to be locked down anyways.

And besides all that, let's invoke the slope, would you install a camera in your home? Even if you would, are you willing to force that upon every other person, regardless of their feelings or wishes?

Sure, let's think of the children. Can we also think of the potential future regime jailing/torturing all their political opponents? Why must we always be asked to think of only one side of the harms?