Opportunist is likely the best description since he certainly seized the opportunity to use slave labor to death to advance his ambitions. I doubt he cared a wit about who he worked for, or what means he used, to further them. He just chose what looked to be the best offer and gloated all the way to the bank.
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"However vast the darkness, we must provide our own light."
Stanley Kubrick
"Tomorrow belongs to those who can hear it coming."
David Bowie