Law enforcement likes to talk about big, scary threats like terrorism, because those make the public more likely to accept their position.

The article below argues that the real use case for breaking encryption is to catch everyday criminals, not to go after shadowy Bond villains. Would the public still go for it, if they looked at it this way? Probably not...

The Encryption Debate Isn't About Stopping Terrorists, It's About Solving Crime https://www.lawfareblog.com/encryption-debate-isnt-about-sto...

Edit: And most everyday criminals are not technologically savvy. Half of them probably have a hard time using Telegram safely.