It's the same situation here. He took money that was due to one group of people and paid some of it to another group of people. This idea that if people make a net profit then it's basically ok even though he took some of their money is totally unsuported by the law for good reason.
This is an example of his character:
A new drug comes before the FDA for approval, and it is opened up for comment. Shkreli lodges an objection to approval of this drug.
Why? Because it's unsafe? No - trials thus far have shown it to be safer than the existing drug options.
Why? Because it's less effective? No - it's also been shown to be more effective than existing drugs.
Perhaps it's more expensive? No - cost of R&D and production, and estimated retail costs are expected to be lower than existing drugs.
Huh, odd. So why in this case would Shkreli oppose this drug getting to the market?
The only reason he lodged an appeal with the FDA had nothing to do with the drug, but was because he and his company had just bought the patent to one of those 'existing drugs' referenced, and this new drug coming to market would crater the demand for his drug, and torpedo the profitability of his investment in buying the patent.
Fuck Martin Shkreli.