This case of your friend requires business insurance, had it been that he insured the business against unforseen circumstances or events, your friend wouldn't be that bordered about what happened to his business as he will be compensated for his business loss. This should be what all serious Businesses should do in the course of their operation.
The only thing he can do in this situation now is to start over, plan this business very well, he should never repeats his first mistake of not insuring his business again risks such as accidents, theft,vandalism e.t.c. This is so that he doesn't get to experience this kind of situation ever again.