When I encounter these two delusional cultists as a Neutral Evil characte I have reason to believe that they are dangerous to me. I tell them to go and avenge the death of their brother by killing the owlbear. My intention is not to go on a Merry owlbear hunt and put my life at risk for these dangerous maniacs. I simply want to manipulate them through their religious zeal to get them killed in a futile owlbear hunt. Why is this not an optional outcome for this encounter?