What would be the harm?

[Angrboda]

The length of penises can be quantified, too, that doesn't make the length of penises the objective basis for morals.

Is the length of a penis a reference to good and bad in the same way that harm obviously is so?  Poor analogy.

You said that harm is objective because it is quantifiable. The problem is not with the analogy but with your claim.

How is harm related to good or bad exactly? You've defined harm as bad. That's not a natural relationship but an arbitrary one that you've drawn, likely out of biologically rooted motivations. Failing such motives, there's nothing from my declaring that having a short penis is bad in the same arbitrary way that you are claiming harm is bad. Unless your belief that harm is bad is rooted in something objective, it's no different. The only objective property that you've linked to harm to suggest that it is bad is that it is quatifiable. As noted, I can make the same link to penis length. Analogy confirmed.