Government is trying to make it illegal for one person to keep secrets and whisper them into another's ear. We can argue all day about how the law doesn't prevent criminals from using technologies (it doesn't, which makes the law idiotic, from a logic perspective), but that's not the important part. The important part is that this group of folks we're calling Government is trying to prevent us from being allowed to h…
While it's convenient to paint this as "the government," many people, the ones who elect most officials, are also of the opinion that if authorized (by some manner) that encrypted data should be made available in plaintext. For the common people this comes in the form "I believe my dead relative's phone has information which will expose their killer, I want the carrier or manufacturer to make that data available, it'…
We already have this concept of "the government can go through your stuff" in the form of search warrants. It's not a leap at all to apply that to encryption, too, even if some specific law gets it wrong at first.
I'm sure if pocket enigma machines were around when these laws were first being put to parchment, there'd have been something in there about encryption from the start.