Chronicles of Darkness (the nWoD core rules for humans) might also be worth a look. It has a form of sanity/morality check that you can use when people take morally questionable actions in response to the dead shambling around. How deadly it is is pretty easily controlled, such that you can have things ranging from the TV series 1st season, when everyone was pretty clumsy, to the current season, when they've all taken several levels of Badass....