i mean how many people that write 'revenge is bad' stories have ever had a real, personal, intentional, malicious, thing-worth-avenging happen to them? how many people that successfully get revenge write books or make movies about it? like many other topics of ethics, it really depends on context imo. obviously bad to murder someone's family for stealing your work lunch, but if they tortured and killed your own family i would understand the desire even if i do not necessarily condone the actions.