My point is that SWA have proved beyond all reasonable doubt that a 30 minute turnaround is not inherently unsafe. Unless there is a substantive difference between SWA and Ryanair practice, there is no reason to believe that Ryanair turnarounds are unsafe.
I don't know whether Ryanair are safe or not - but any suggestion they aren't based on the bare statement that their turnaround time is too short is fundamentally flawed.