Schadenfreude (again)

Maybe a good general test (though there may be exceptions to it) to see if one is joyous at the suffering of another person is due to sadistic or other rather reprehensible reasons or due to reasons I gave that are not reprehensible is if the person feeling it really desire that the object of the misfortune suffer? If they don't really desire it then their delight is due to these other reasons as opposed to the reprehensible ones.