First Lono I think you have this the wrong way round. People should be allowed to do anything till it's proven they should have that right taken away from them. Not them having to prove they should keep it.

And 'In a shelter' assumes you make it that far without problem. If you were evacuating a city it'd be for a reason. A lot can go wrong.
Someone can need cutting out of a car or seatbelt. You might need to cut your way through the roof in a flood. You might need to cut an injured person out of their clothes to bandage them or cut open a tin of food you've found. Prise your way out of a lift, cut through an interior wall. Improvise a stove from an old can to keep warm, Cut up furniture for the stuffing as installation. Improvise a crutch...
It's a list as long as your imagination.
The Sock