You have to have respect for you team,unit , group so that you work as one.I understand also that we are talking life and death situations. Also I understand that you have to be cruel to be kind. That object lesson as you so rightly say has made him into the soldier that other men would respect and be proud to stand next to.
The other kind off hazing etcc.. that goes on behind closed doors ...no!
I think thats just downright brutallity played out by people with very small minds.