Agreed as far as sport hunting goes.
I grew up in the boonies where this was commonplace (and expected), and I realized early in life that there was just something "wrong" about trophy hunting and the people who relished in it. Don't get me wrong: I hunted in my youth and still go hunting on occasion, but I eat everything I kill and find taxidermy distasteful.
On the flip side, there is a legitimate population control aspect for hunting seasons. Left unchecked, deer population explodes to become a nuisance to humans (causing car accidents, eating crops, etc) as well as limiting resources for the deer (hence the strict laws / regulations surrounding it). So, it does have its purpose, but it also seems like it appeals mostly to the "psychopath" types you're describing.
I realize this doesn't cover fishing, but I don't have a horse in that race. Fishing is so damn boring that I could never get into it. But I'll agree with you on trophy fishing as it's the same mindset.