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First, yes, you are paranoid. Second, there is no demand, because people aren't as paranoid as you and nobody else considers the #1 use to emergencies past 1999. I can't imagine convincing most around me to give up their Samsung or iPhone for a hardened-panic-mode phone without apps.

It is better to reinforce good habits than have a panic button. Teenagers were terrible drivers before texting and they will be when holograms or whatever come next. Danger-mode apps exist, I think, but they aren't widely used because I don't think they're useful.

Perhaps someone with law enforcement background can speak more intelligently about it, but my gut would be that good practices are better. (e.g., making sure you know when someone is leaving / walking out the door so you know when to expect them, etc)