RE: Hunting and fishing can force rapid evolutionary changes
Some of that may be true, but you also have to take into account that there are no natural predators for a lot of game species in many areas. If it wasn't for hunting they would be out of control. Deer populations are better than ever and many game species are thriving due to management tactics, brought about by sportsman.
The part about the nets seem to target commercial fishing. As for the taking of the larger specimens in the species, that is actually to control the number of fish taken and individually and even collectively, rod and reel anglers would be hard pressed to over fish or deplete a species within a large body of water (ex. oceans or large rivers). Lakes have creel limits, because they are trying to create an environment where you can go and catch fish regularly.
The part about the horns; i don't know how true that is. There will always be hunters who will hunt soley for trophy purposes and have no desire to harvest an animal for eating. It is certainly easier to bag a younger animal with smaller horns, and you see more of them because they are not as smart as the older animals with bigger horns. In my opinion as long as they do not let the rest of the animal go to waste once they have their trophy then they are fine.
The bottom line is and always will be that more good than bad comes from hunting and fishing. The only other option is to start killing people and abandon cities and towns and let nature take back over, but that is not going to happen.