Yes this can be debated all day - maybe sprinklers aren't the answer but IMHO if you are at the level of a PE and responsible for the well being of 3,000 animals, have an unoccupied building at night, had many thousands in inventory and fixtures and you already are paying for a burglar alarm company - wouldn't ya think you'd want to have monitoring for smoke and temperature too? It just makes no sense to me. Probably just a couple bucks more per month..... hell I know a person who raises guinea pigs that has that stuff in her buildings- she gets a call if the building gets 5 degrees over what it should be! Let alone hot enough to break the windows!
You have to be pro-active with this stuff but too many people are so keen on getting the next hot new morph or species that they skimp on the basics like an adequate electrical system, smoke detection, etc.
Allow me to play devils advocate:
If PE let all their animals starve to death, for example, there would be a huge uproar in the herp community but here they basically let all their animals die by apparently not having any early smoke/fire detection system in place, but thats o.k. I guess and they will get sympathy...? Most likely this fire started out as a small smoldering type thing from a heat or electrical source and could have easily been detected early on.
Its unfortunate situation but hopefully this will be a wake up call for others! Be overly cautious, have redundant systems, think of all possible scenarios that could happen to your facility - Especially with all the potential fire hazards used with reptiles!