Unfortunately you just don't understand hunting with a bow very well, take no offence but they are right. A bow kills by bleeding or letting air in above the diaphragm, that's the way it is, so you make your shot and you sit and wait as quietly as you can to avoid spooking the animal further and let it bleed out. If you stick it immediately with another arrow it can run ungodly distances now that you've really spiked it's adrenaline. Many animals will bleed out with quite surprising calm, and not travel far if you're silent and wait. Bows also are never, ever head shot implements, arrows deflect on angled bone surfaces like skulls far too easily. It seems in general your hunting knowledge is limited, so I'd avoid strong opinions just yet, and soak up all you can learn here. Cheers!
And hey how are we on bowhunting Eland from an obscure south american monkey question!