Tanach mentions how the Israelites were supposed to drive out the Canaanites but failed to.
If one lives in the time of Tanach:
Is one liable for murdering, robbing, coveting from, burning down the field of, etc. a Canaanite who retains his religion and is thus not a Ger Toshav?
My enlightenment-tainted morality would say that you can't, but it could very well be that the Canaanite is liable to be conquered.