I don't think that "makes mistakes -> dumb" is a valid conclusion. People make mistakes based on limited time, limited information, and various other reasons.

As an example that isn't too far from third-party ink cartridges, as a user I'd like app store owners to apply quality control measures to the contents of the app store so it doesn't contain malware. Sure, you could argue that users aren't dumb and can decide which apps to install on their own, but in practice the amount of knowledge and time needed to decide whether an app is malware is incredibly high, up to disassembling and analyzing the code.

Just to avoid a misunderstanding: I wouldn't actually like third-party ink cartridges to be blocked. But the limited resources of the customer are a problem that should be recognized.