Actually, by doing e2e encryption, Meta can say to the authorities that Meta doesn't see any message and cannot be blamed for anything. We cannot snoop user's conversation, and that's generally a good thing.

The authority holds Meta responsible anyway; they don't care about the implementation detail. They want to catch a pedo, and Meta is unable to produce evidence that helps them. Everyone else will yell at Meta for helping pedos.

You can substitute "pedo" with any other heinous crime e.g. terrorism.

And this is how we arrive at the current situation.