Chase is a global bank with ~200k employees. There's always issues, most of which are fairly minor/low-risk financially, but may have significant reputational or other impacts. In this scenario, you have counsel and risk management people looking at a scenario where a guy basically stole $5,000 from the bank, due to an error on the part of the bank. They don't give a flying leap about the error -- it's not their job to care, the event becomes the problem.

$5,000 from an FDIC institution is a very serious crime. My guess is that the internal discussion was filing a criminal complaint and exposing their dirty laundry in court, or cutting the losses and severing the relationship. But the guy in question here did something really dumb, was very lucky, and should stfu.