I think a more appropriate question (assuming I understand the intent of your original question) would be: How many people have been killed there as a result of negligence by the company?
Last time I checked the answer is : Zero.
I worked there nearly 7 years. Some of the guys who bought it I knew, even considered friends. But at the end of the day, I can't deny the fact that they made mistakes which resulted in their demise. In only one case could I see any way in which AMF could share some responsibility and even then it is pretty small (Metro in Spokane).
It has been said on here before, Single pilot 135 freight is dangerous business, the risks are high, and the margin for error is low. I believe AMF does a good job of washng out some of those who don't belong, preparing those who do for the job, and giving them the right tools to do the job. After that, it's up to the aviator to get the job done safely.
Been wanting to get that off my chest for a while there ...