And the jobseeker replies, "But all those transgressions are in the past. Sunk costs can't play into my decision theory—it would hardly be helping for me to go sulk in a gutter somewhere. I can only seek to maximize expected utility now, and right now that means working ever so hard for you, O dearest future boss! Tsuyoku naritai!"

I am failing to understand how two felonies in my past are sunk costs. How are events costs? Am I missing a layer of abstraction?