It’s all a “think of the children” race-to-the-bottum where rent-seekers abuse fear and sycophanty to monopolize critical infrastructure.
But Apple's security measures definitely help against virtually anything else. Over-zealous police and border patrol. Script kiddies. General spyware and malware.
I think you're forgetting how bad mobile security was before both Apple and Google started adding these hardening measures to their flagship devices. You really couldn't trust your phone at all. Now, you somewhat can.
My comment was specifically targeting the fact that jail breaking somehow encourages people to develop means of circumventing the security of devices. This is when this becomes dangerous - suddenly it has the potential to hurt unsuspecting users. Saying that the responsibility is with Apple (or Google) to make this possible feels like a straw man argument - their job is to earn money (no illusions there) and keep users safe, even if it means making it harder to tinker (which also helps them earn money)
Where does this end? Should all devices that have computers attached be capable of being 'rooted'?
You would not have the expectation if for example you purchased an MRI machine, that it should be able to emulate a Game Boy. A phone is also a special purpose computer; and the phone's software is designed to guarantee that those special purposes always work.
In my opinion this is the main thing that this root crowd does not understand; the iPhone is not a general purpose computing device. You should not have bought one if that's what you wanted. The market is full of general purpose computers that can make phone calls.
The manufacturer has no say on the usage, simple as that. That there are better ways to tinker is irrelevant. It doesn't preclude the right of people to tinker with anything they own at their own convenience, including an iPhone if that's what they got.