Astro, as you know SWA doesn't have a single widebody in its fleet. Loading bags on a 737 is easier than loading bags on a Greyhound bus. I think the CPT did an honorable action. The alternative may have been the crew times out, 170 PAX get deplaned and have to get lodging for the night, etc. Mission first, people always.
The 737 was designed to be loaded easily - that is the reason for the Max problems - the landing gear is short and stubby, to make loading easier, and you cannot fix the low rider or the clearance problems with bigger engines. Sure, it’s easy to load. Does that pilot know how to load it? How to secure it? How to get the weight and balance correct? Unlikely. Maybe, but unlikely. So, there is risk to the flight.
There is cancelation risk to the flight with this action.
There is personal risk to the captain, and FO, themselves, in this action.
Aviation is about avoiding risk. Doing risky stuff is generally frowned on, and for good reason.
I know many SWA Captains - they all agree with me that this was stupid. It was done once before, a while ago. It was risky. It is fixing a problem that SWA created at personal risk to the crew. An OJI (on the job injury) hurts the pilot, and hurts their pay, and hurts all the people whose flights get canceled for lack of crew while this pilot is out on an OJI.
If the world was really “mission first, people always” - then SWA would have baggage handlers. SWA would take care of its people so that they would show up for work because they were well-paid, and well motivated. But they don’t.
The SWA pilots are fed up with be mistreated. This pilot was likely fed up with SWA, and this was done in frustration so that he could get home. While this “mission” was to get people to weddings, funerals, meetings, cruises, whatever, none of that stuff is worth injury to the pilot. The pilot is not wearing his back support, like the baggage folks wear.
Let’s take a similar scenario - you are rushed into microsurgery, to be performed by one of the best hand surgeons in the country. It will repair that severe injury you got from attaching a fifth wheel trailer, where your hand is partially severed, and she can re-plant everything, but only if they get you into surgery in the next 12 hours, before the tissue starts to die.
That morning, the surgeon hurt herself because she was doing some other strenuous task at the hospital, for which she was not trained, and she then has to cancel the microsurgery that was scheduled for you. You risk losing your hand. It may not survive without her immediate intervention in reattaching tendons, nerves, and blood vessels.
That surgeon isn’t a “hero” for the strenuous task, they are a fool, for doing something for which they aren’t trained, and having a consequence that hurt someone else.
This guy is your hero.
But he is a fool. He took risks, to the flight, to himself, that he should not have taken. Nothing honorable in that.