Believe it or not, I'll actually defend SWA when it comes to fatigue. They have the industry-leading fatigue policy by far. Call in fatigued, it's not only no-fault, but they actually pay you for the fatigue call.
Again, this is a contract issue, because it's QOL related. Nothing in the science indicates that an 8 day stretch of flying with a day off in between is fatiguing as long as you've had the sleep opportunities that 117 provides. And in reality, SWA's schedules usually provide far more than the required 117 sleep opportunities, with the average overnight being somewhere around 15-16 hours. You're not fatigued at the end of those 8 days, you're just ready to go home. And that's why SWAPA needs to stop stroking their W2 and realize that their contract absolutely sucks when it comes to work rules. Especially since their W2s aren't even as hot as they think they are anymore.