The right to secret communication. The right of not being under surveillance. The government cannot open letters without a warrant, but somehow Apple, Google, MS and co can sniff through electronic communication as they see fit because of a clause in an EULA. No idea how came there, but maybe the days when Stasi surveillance was the poster child of government intrusion into private life are too long gone to be remembered. Or they aren't and certain people choose to make shit load of money from the thing.
Might as well make it legal for police to search our houses at will, as long as they are looking for child abuse images. Doesn’t sound much like the US any more at that point.
Google is checking, apparently, Gmail for cp. Apple is doing it, soon, on your phone. Checking your mail for analog cp requires a warrant and can only be done by police. See the difference?
