I think many might not be aware of Starliner's sordid history. It has failed essentially every qualification test in various ways. Their pad abort test (where you simulate a launch abort while on the launch pad) resulted in only 2 of the 3 parachutes deploying in beyond optimal conditions. NASA considered that such a resounding success that they let them completely skip the far more challenging in-flight abort test. Their first automated mission to the ISS completely failed and did not make it to the station. NASA finally required a redo from Boeing and their second one did make it to the ISS, but only after experiencing widespread leaks and thruster failures literally identical to the ones that have now left these astronauts stranded.

If SpaceX or another company had remotely similar results, they would never have been greenlit. For instance in spite of a flawless pad abort test, NASA required SpaceX also carry out an in-flight abort. And that's completely reasonable - you don't simply skip tests, even with optimal performance. Skipping tests following suboptimal performance is simply unjustifiable. And so I think we're largely looking at another Challenger type disaster caused by a disconnect between management (and likely political appointees) versus engineering staff, rather than inherent risk. But this is not a vessel that should have ever had a single human anywhere near it, and so their official comments (and even actions) on the situation are going to be heavily biased due to their own behaviors.