With age I came to conclusion that anything making killing of any kind even remotely fun is utterly wrong. It might be necessary with dangerous insects, but it should not be fun or recreational.
This is a really interesting position, I'm interested in how you arrived at it. Do you think that if killing something is fun it will result in more things being killed, or is your issue more fundamentally with the idea of killing being fun?
Essentially, my stance is that there is a difference between accepting an action as necessary and engaging with it as needed and making said action fun / associating it with enjoyment. I don't count video games as part of the issue for the moment since, at least currently, it does not seem like the characters and units that populate video games are in any sense alive. This may change, however, and if it does then I expect radical consequences will unfold.