Earlier quoted context omitted.
Remember that aphorisms like that don't only apply to your side. Every time you say something like that, imagine that someone whose sense of injustice is opposite to yours is using it. Maybe they think that abortion is literal murder. Maybe it's the 1950s and they think some poor black guy has raped a white girl (because how would she ever consent?) Maybe they're a Russian living in Ukraine and they think the Ukraini…
> Every time you say something like that, imagine that someone whose sense of injustice is opposite to yours is using it. This line of reasoning only makes sense if you think that moral positions have no qualities other than how strongly people hold them. If, on the other hand, you believe that two people can hold two opposing moral positions with equal strength, and one of them can be correct while the other is inco…
Of course there are differences in moral positions other than how strongly people hold them. But if you're going to make a rule about them, your rule can't take those differences into account, because everyone thinks their own moral position is correct.
It's like having a rule "the police may coerce confessions from suspects, but only if they're guilty". This rule is impossible in practice because every officer coercing a confession thinks the suspect is guilty.