A 9-figure acquisition sounds like a lot, but consider that this is less than 0.05% of JP Morgan's market cap. Their market cap is down $6 billion today, and it's not even a particularly notable day.

And it's not like that money is completely gone. JPM will sue and probably recover a very large chunk of it. Say that of the $175 million, they get back $150M, so they are out $25M. It's just not that much money to them. Sure, someone didn't do their job and will probably get fired over this, but Jamie Dimon and the executive suite don't really think about $25M losses.