Apple is not attempting to create an adult content free device (not that it'd be a good idea if they were; it's just that is clearly not a thing they are attempting to do).
On the web, Apple has a lot less control over content, and so it would be difficult for them to censor it effectively (and customers perceive it as open, so if Apple introduced mandatory filtering in Safari, it likely would cause a lot of backlash). But in the App Store, where they have more control, creating a device free of adult content absolutely seems to be their goal.
Do you have any data supporting that claim?
> Who are we to force it upon them?
This is a red herring that makes "us" the subject instead of Apple.