Apples and oranges, brother, apples and oranges.
There is a huge unknown as to the contents of your average everyday dwelling fire. There are no requirements for placarding. There is no requirement that the tenant declare their contents. There is no requirement that the owner demand no hazardous materials. But guess what, we go in ANYWAY! Why? Because thats our J.O.B. We take an oath to protect life and property. You may fail to realize that many people store their entire livelyhood in these places and as has already been pointed out, some DO live in these places.
What also makes ME sick is FF who refuse to take any risk in a job that is risky from the bell, they are complacent and anti-aggressive. Its one of those things that kill firefighters.