I think it's possible that we might be the weird ones. In the environment that our distant ancestors inhabited, squeamishness about harming animals might have been a significant disadvantage.
Or maybe not. Joseph Campbell claimed that a common feature of tribal mythology is ceremonial apologies and restitutions to animal spirits to make restitution for the need to kill them.
I think it all depends on the adults in your life. Maybe if we'd had a leader who said don't do that instead of "well they can't feel pain and they're pests" things would have gone differently.
Or maybe not. Joseph Campbell claimed that a common feature of tribal mythology is ceremonial apologies and restitutions to animal spirits to make restitution for the need to kill them.