I know this is going to be unpopular, but... Comcast is a business, and their goal is to make ever increasing profit. Yes it's horrible your family and hundreds of others lost everything due to a natural disaster, but that's not Comcast's fault or problem. When you signed up for service from them, I'll bet it's in the fine print that you are responsible for returning the cable box. If it got stolen, that's not Comcas…
The costs still get passed on to customers, but are distributed among all customers, are not incurred as an additional fee or cost at a time of hardship, and Comcast's size and negotiating power against an insurance company would almost certainly result in more favorable rates and terms than an individual could secure.
To say nothing of the brand management issues which would be avoided.