Conrad Anker is a well-known serious mountain climber. The other two I've never heard of.
There's a saying my flying instructor had: "There are old pilots, there are bold pilots, there are no old, bold pilots." Same with climbers.
Anker simply cannot control all the risks in this type of climbing. Avalanches aren't always predictable, protection fails, one mis-ties knots, people get goofy from altitude, equipment breaks or otherwise fails, stuff gets dropped, everything takes too long and supplies run short, someone breaks a leg, the list is endless.
If one can control the risks, fine. But when you can't, as is the case here, that's flat dangerous. It will catch up with people eventually.