Sorry edited it while you where responding - Let’s start here:
What makes one killing murder and another not murder?
I have given the Churches teaching and I do not have time now to go step by step though everything. The Church has given the needed understanding of these things --I refer you to the Catechism, the Compendium and Pope John Paul II"s document on Moral Theology (Splendor of Truth)
It is important too for all of us to avoid what Paul says to avoid --that is arguing over words. Cause sometimes it comes down to that in these sorts of discussions. It is a temptation that takes our time all too often here.
And speaking of Paul he the quote above from his letter is very to the point.
Quoted above by Bl. Pope John Paul II --St. Paul states such is an idea is condemned:
"There are those who say: And why not do evil that good may come? Their condemnation is just’ (Rom 3:8).
Anyhow I have to be about Family Life – I cannot get further into this right now.
Nice is a very summary from Compendium issued by Pope Benedict XVI
- What are the sources of the morality of human acts?
1749-1754
1757-1758
The morality of human acts depends on three sources: the object chosen, either a true or apparent good; the intention of the subject who acts, that is, the purpose for which the subject performs the act; and the circumstances of the act, which include its consequences.
- When is an act morally good?
1755-1756
1759-1760
An act is morally good when it assumes simultaneously the goodness of the object, of the end, and of the circumstances. A chosen object can by itself vitiate an act in its entirety, even if the intention is good. It is not licit to do evil so that good may result from it. An evil end corrupts the action, even if the object is good in itself. On the other hand, a good end does not make an act good if the object of that act is evil, since the end does not justify the means. Circumstances can increase or diminish the responsibility of the one who is acting but they cannot change the moral quality of the acts themselves. They never make good an act which is in itself evil.
- Are there acts which are always illicit?
1756
1761
There are some acts which, in and of themselves, are always illicit by reason of their object (for example, blasphemy, homicide, adultery). Choosing such acts entails a disorder of the will, that is, a moral evil which can never be justified by appealing to the good effects which could possibly result from them.
vatican.va/archive/compendium_ccc/documents/archive_2005_compendium-ccc_en.html
Such is the Teaching of the Church
That really sums it up and there is not need to keep going back and forth with us seeking to reinvent the moral wheel.