I must be missing something. Through all ages, most philosophy, especially those that answer ethics, allow and encourage cruel acts against other human being. It’s the norm. It’s not the exception.
We like to believe that it’s only done on exceptional cases. Still, those exception is more of a norm than exception.
In fact, libertarianism is the only school of ethics that do not justify cruelty, at least not consensually, nor encourage cruelty to others. Exceptions are arguable like in cases of shooting burglars slowly to death. But the burglars ask for it so it’s like consensual right? Okay just kidding but you got the point.