If karma is intention, how is it karmically pure to intentionally allow others to do your dirty work for you (e.g., to kill or be selfish to obtain your food or money, to kill people or steal things to defend your home or country, to kill germs or bugs in your home or office, to raise children so you don’t have to, etc.)? Aren’t you intentionally neglecting what is karmically best for the person who is serving you?
Similarly, even if someone didn’t intend to do a particular act of violence (e.g., to hit someone with their car), mustn’t there have been a intentional decision/willingness to create the circumstances that might give rise to that particular act of violence (e.g., to drive a car instead of taking another mode of transportation, to drive too fast, not to pay very close attention to the road, etc.)?
Some might argue that the act of generosity in serving another person cancels-out the impurity of the bad action, but the early Buddhist seed-and-fruit metaphor seems to say that each karmic seed bears one karmic fruit, meaning that both the bad deed and the good deed will bear separate fruits.