What kills is the destruction of the vital organs or the CNS being hit. It's all about shot placement and how the bullet performs i.e. penetrate and expand.
No argument here. We have such a huge variety of bullets that will do the job(across the spectrum of calibers) that we've become a bit spoiled. Not that that is a bad thing?
"For joy of knowing what may not be known we take the golden road to Samarkand." James Elroy Flecker
