At that point he had been stiffing his pilots on wages for weeks or months, and with many also paying fuel bills on their personal credit cards/checks, since many fuelers had canceled FedEx's accounts.
Yeah, $5K isn't a whole lot, but if I'm a pilot struggling to put food on my family's table, and the CEO takes company money to Vegas, I'm not thinking "Oh, but the investors" or "Sure, it's not that much money anyway".
I don't see why people (not saying you, in particular) see this as some heroic founder "risking it all". He wasn't. He was risking the company's "all", after asking the employees to suck up his mismanagement.