I don't. I claim that if Apple does believe that, then OP's retort is bad.

Do you think Apple does believe that?

I haven't made up my opinion. Part of me thinks that if they had nothing to hide, they'd show their code.

That doesn’t scale.

If the solution was always just ‘show your code’, anyone could make up an allegation against them as a way to get them to reveal source code.

Also - arguing that if you’ve done nothing wrong you should have nothing to hide, is a bizarre position to take in an argument about privacy.

If we were to apply it to Apple, we would need to apply it to everyone.

If someone actually produced evidence of Apple lying here, that would be a different matter.

Nobody has produced any evidence at all.

It's not a bizarre position to take when someone wants something to come live in your digital home.

I'm not saying "Tim Cook has something to hide because he won't show us his private life". I'm saying "Apple wants to send a machine to come live in other people's homes; if they won't show the machine's insides, I wouldn't trust that they've got nothing to hide".