I'm within 2 degrees of separation of Strempler individual (I know a few people who went to high school/university with him).
The feeling as I understand it is that Strempler is/was actually hounestly trying to provide reliable drugs, an the company did do regular testing. However, the problem that come in that the global supply chain is full of counterfeits (thank globalisation and the far east). Stock from one supplier can be reliable one week, and not the next.
Perhaps having to do this extra testing has an upward pressure on drug costs in the US, and perhaps not doing enough testing is Strempler's mistake.
Is it excusable? No. I think it's a case of Misfeasance or Nonfeasance; not Malfeasance.
As an aside, he probably meant to go to Miami Manitoba, not Miami Florida - it's an easy mistake ;-)