I think this all comes down to how you separate the medium of communication and the content. Nobody cares that you can send encrypted emails between people on any server in the world. Or place encrypted files on any number on free cloud storage solutions. End to end encrypted communication between anonymous parties is fairly easily achieved if you just think about it a little. We don't hold those systems liable for the content they transmit unknowingly, either legally or in public opinion.
Why is it different for chat services? Have we just become conditioned because Facebook, Twitter, etc decided they needed to police their networks?
That's far better than going "HOLY SHIT THE WING IS FALLING OFF!". In an emergency you need to be calm but decisive, and not spread panic.