A train of though on the subject;
When we stub our toe and it starts to bleed, we would do well to go to the first aid kit and get out some antiseptic, at the very least wash it in clean water.
The wound needs to heal, but there are impurities on the skin and in the environment that may stop that happening, and worse if left unclean could cause infection and blood poisoning.
Humanity has stubbed it toe. No one knows when or how, but something is obviously wrong. It need to heal, it needs to remove the impurities so it may heal and not die of poisoning.
We are not technology. No, we are organisms that are far beyond anything we have invented, yet we are full of impurities, including plenty in our mind, which are making us sick.
If you are reacting, that is equivalent of the sting when that sore toe get cleaned.
They are called impurities because they are impurities. That isn't a moral thing, just a fact of being an organism in a world of impurities. Changing the names to suit your sensibilities would be the equivalent of calling the proverbial poison arrow 'a developmental block'.
Not having a go, but aren't we rearranging the chairs on the Titanic when we want make the dhamma suit our particular bent because we don't understand why it is as it is ? Lifeboats are called lifeboats, climb in and we can talk about how you reacted to the implications of what they are called later.
I very much think our minds are full of impurities. What people do about that is up to them, if 'developing beyond them' is what you wish to call it, great. We are in the same lifeboat whether it is called that or a 'further development enabling craft'...
On a personal level, I was reacting in the same way to moral judgements, until it really came to a head and I realised I was simply denying the true depth of anguish in the world. Life, as it is, is indeed suffering. When I let my conscience back out of the closet, I could see how I had denied the plain and obvious, yet desperately unpleasant truth, I was going to have to confront the 'impurities' in me. Plain and simple. How? Constant Sati, watch everything, recursively, 'happily', no matter how it stings. But it, as we know, gets better...we heal.
I'll stick with Purification and antiseptic.