I think law enforcement should be able to intercept messages on services like WhatsApp, if someone is suspected of criminal activity.
Is it right for criminals to be able to share child abuse material, or plans for terrorism, over something like WhatsApp? Without law enforcement being able to intercept these messages?
I think law enforcement can break into your home if they have a court warrant, right? So why not allow the same thing with electronic communications?
Maybe it's worth having that security hole then. I think it's a bit crazy that terrorists or child abusers can plan their crimes using WhatsApp without the police being able to intercept their messages.
Also, if we're able to contact our banks over the internet securely (and obviously the bank can still see everything about our accounts if they want, while criminals hopefully won't be able to), then surely an equivalent should be possible for things like WhatsApp.