Or when the user's location reporting is off, or their network has been firewalled, or they're 60 miles away at work but really would have liked to know that a storm was coming for their house?
I mean sure, you may face some public outrage. On the other hand, you may have to deal with a twitstorm for any number of other ridiculous reasons. Should the ideal really be to give everyone safety scissors because you're worried about the rare dolt that doesn't know which end to hold? That's the kind of attitude that dumbs the whole of society down and fuels the entitled mob who blames everyone else for their own mistakes.
What you called the user's "best interest" is based on know-it-all paternalism. For 90% of things it will agree, but don't mistake your model user's utility function for actual individuals'.
(And for your li-ion example, there's a reason that's done with a thermal fuse instead of software, which means that the design is fixed. But to the extent that it is done in software instead, then yes it should be end-user adjustable, even if it seems like a really bad idea for them to do so)