If owners where fires start were liable for the damage the fire does to others, there would be much less resistance to retrofitting with sprinklers.  Especially condo owners who rent their apartments would be very foolish not to have sprinklers if they were held liable.  And with such a law in place, it would probably be next to impossible to insure your condo without a sprinkler system.  It shouldn't be that hard to insist on common sense safety!