Thanks, Casiopea. But i don't think that helps to explain the idiom, or do you not think that the example i quoted is an idiom to begin with?

"Viewpoint" can be a synonym for "aspect" sometimes, but an idiom cannot be understood only in terms of the individual words that it contains. So substituting a synonym for a word in an idiom couldn't give you the sense of the idiom.

When i searched online for the meaning of the expression, "through the aspect of", i found many instances of it in use, but i found nothing that explained the meaning of the idiom itself.

My best guess at this would be that it views the context which is being referred to in the example from the perspective of mercy rather than that of justice ("judging"). In that case, mercy is being taken as a higher value than justice, and mercy therefor prevails over mere justice. But i still need to know for sure if that's how it's intended.

Thanks anyway.
Regards