How to program your phone so you can't turn it off without a password or fingerprint. What's the point of find my iPhone if someone can just turn it off.

This would require a bottom up change in the way the OS operates. Not going to happen.

Another side of that issue to consider is repairing the device physically. If the screen is destroyed,

how other than risking doing further damage, would you suggest someone power off the phone if

they cannot read it or touch doesn't work? Can't be done, sorry.