This has nothing to do with keeping people safe.
...and...
some people are gullible enough to go into a hidden setting on their phone and enable that in order to install an app from a random Chinese website
are kind of contradictory.
It's not a contradiction. Removing that setting solves that problem, but it's not the only solution.
There's much easier ways for gullible people to be scammed than convincing them to install an android app.