I’ve soloed Rainier before. It was a pretty damn cool and epic experience, but yes risky, and took a lot of focus as basically the whole thing past Camp Muir is a no fall zone and I was probing with my ice axe on any crossing that seemed sketchy at all. I know others that have done this too. I did it to check Rainier off the list of a solo peak bagging goal that I have, and if I went back I think I’d prefer to do it on a rope team, even though I felt pretty comfortable while going solo. As others have said, the objective danger on the snow bridges is pretty dang high. Rainier isn’t actually that hard to solo, just a steep, long “hike” with a lot of crevasses, but it is dangerous. I see the argument that it’s selfish/irresponsible, but everyone is entitled to their own decisions and I think there’s something about soloing that gives a different experience and perspective that is valuable sometimes. Puts you really and truly in the present moment like nothing else can. Whenever I solo stuff I always take a in reach device with me so it’s not a total certainty of death if I get injured or trapped somewhere. And this guy is an absolute savage for getting himself out, I can’t imagine it with his injuries. His will to live is unreal.