There was an interview with the CEO of Signal and some UK conservative politician[1]. It's a pretty infuriating interview, as both parties try to debate two complete separate issues. Meredith Whittaker of Signal, rightfully tries to debate the issues with breaking encryption and it's ramification, but the politician has that sorted. See they don't want to break the encryption, they want the apps to pick up the messages BEFORE encryption and side channel them to some government agency, at least that's my understanding. They want on device access to the message, which the app have, they just also want that information searched, indexed and filtered and sent to the police.
It's sad that these politicians don't see the problem... Well either don't see or understand, or they full well understand and that's the point, they're just doing a poor job of explaining why.