There is arrogance and cowboy attitudes, and there is risking safety- at 50k feet your blood will boil off in case you lose pressurization.Hi,
Fighter pilots are like cowboys---. Everyone wants to show off his " quick Draw ".
So---when he flew to 60K---he was checking his endurance and that of the aircraft's as well---and also showing off that " I did it ".
One should also keep in mind the 10-12% margin---.
To top it off,you have a young trainee in the backseat with you, an extremely precious asset that is barely kept flying due to sanctions- and neither of you are wearing pressure suits which means that in case something happens you are both dead along with the multi million dollar aircraft.
Sure, common sense eventually kicked in but its these hot dog moments that get you killed