Once you kill something it is only respectful to use the entire creature. I doubt they do, though. And in that case, they are no better than the poachers who kill bears around here just to take the gall bladders and leave the carcasses. Those sorts are not what I would consider even human, but some sort of subspecies. The same sort that victimize seniors.
I doubt pilot whales reproduce in the thousands each year. But they are killed in the thousands. Perhaps the same with harbor porpoises. And creatures like this one don't stand a chance against urban development:
<--- The Xerxes blue butterfly.
Perrin's cave beetle, considered extinct since 2006. There are thousands more.
Mass Extinction of Insects May Be Occurring Undetected
Want to know where most of the toxins head for? The creatures at the tops of the food chains get the highest concentrations. Guess where creatures like orca, salmon, tigers, bears, HUMANS, sharks, etc. are.
Do you like tuna? It contains mercury. It may not be enough to harm you but it does harm babies.
NRDC: Mercury Contamination in Fish - Consumer Guide to Mercury in Fish
Anyway, from killing off entire species, to destroying our own species, you'd think we'd grab a brain and stop. But, people have this attitude that they are alive and that's what's important so let the next guy worry about that stuff. I have a friend from Florida who got a degree or two in wildlife management. She did one of her thesises on the apple snail of the Florida everglades. It was threatened at one time because people wanted to drain the everglades. That in turn directly impacts the Evergreens kite. And that is only the beginning of one story. There are thousands of species in the glades that are affected by simply dropping the water level there.
In Colotado it was believed that wolves were killing too much stock. So people hunted them until there were none left there. Then someone noticed that there were only a few species of trees that were starting sprouts. Cottonwood was the heaviest hit. Why? Because the elk were eating all the tree shoots. The wolves were the balance that kept the elk population from booming. So they got some wolves from Canada to restore the balance.
Like I said in another thread, "Good day, sir and madam. We don't have a menu anymore as we can only serve you cockroaches from now on. The ants all disappeared and the last of the other scavengers last week. Would you like your roaches boiled, fried, fricaseed, or roasted? Oh, I am sorry, I forgot, we can't give you boiled roaches anymore. There isn't enough palatable water left for that."