I mean one of the basic rules when you're acting is that you mustn't stand in judgement on a character, you mustn't say Hitler was a bad man because you can't act in that way. ↗
The only way that you can find any semblance of a rule, or make any semblance of your own rule, is to tear up the rulebook. Throw it out, burn it, throw it away, and make your own rules. ↗