Very interesting article. I've been thinking about this more often recently (perhaps it's watching the 31C3 talks that do it) and I find that I'm becoming increasingly conflicted over the whole issue of surveillance. On one level, my gut instinct is "mass surveillance of innocent people is wrong"... But the moment I think of it from the law enforcement point of view, I realise how desperately I'd want that bulk data…
80% of sexual abuse of minors happens within existing social contexts, that is "family and friends".
It would be useful to place cameras in every single private room and have them be automatically monitored and the live feed passed to some on-staff LEO when software considers anything suspect.
Are you at peace with that? If so, why? If not, why not?
(Yes, it's an extreme example. Both in terms of privacy intrusion and in the potential of helping law enforcement with a 'worthy cause'. It's why I think this example is particularly helpful to consider one's position)