Yup same fisherman would love to kill bowfin, gars, bullheads, rock bass and eelpout simply because they dont want these fish to eat their favorite gamefish, yet they are native to same areas. I had this friend who hates rock bass and bowfin that he would kill them because he don't want them eating walleyes althrough he stopped doing that after I confronted him. Noted that most walleyes in Minnesota are not native to most lakes.And these are the same fisherman who destroy the native gar population for fear of what they'll do to sport fish.
I knew some fisherman will kill muskellunge and northern pike for just fun or doesn't want them in "their" waters because they dont want these predators to eating all edible fish.