Is it possible that I may be discounting external motivations to sport fishing that are at least as legitimate or redeemable to those which influence the kind of attention I give bugs? Yes.
But let me attempt to shed that bias, and I struggle to see an equivalency or parallels. Whether I go to raise my sneaker above an army of hungry ants, or step on a spider, or smash a pesky bee, the goal is often to repel or destroy unwanted invaders either because they are annoying, may sting or bite, or in the case of spiders, are just creepy. Sport fishers aren't trying to repel invaders, though. Rather, they are traveling often long distances to seek out the animals' habitat without any intention of using them for meat. I wonder what external factors would influence them to do such a thing?
What concerns me more though is the jarring difference in the degree of planning and intent. Swatting down a bee is an unthinking, split second decision. Similarly, not much thought or planning goes into stepping on a spider for some overly dramatic girl; if they want me to see me demonstrate my machismo, why not? Even walking over to stamp my feet on invading ants is relatively spontaneous.
By contrast, people who sport fish literally plan ahead, prepare for, and travel long distances to go and do something that will injure and and potentially kill. It brings "going out of your way to harm something" to a whole different level, even if we cast aside motivation for the time being. There is long term planning and time investment that goes into sport fishing, there are gears turning in the person head, they look forward to it. Think about that... even if the people aren't cruel-minded, their commitment to an activity that hurts significantly more complex animals seems to be. I'm not saying bug squashers and sport fishermen don't sometimes overlap. But I'm critical of how one activity is embraced while the other one is written off as immature or cruel.