You dont have to wait till someone shoots at you first, to shoot back in order for it to be self defence!
If you're on the battlefield, its safe to assume that the enemy soldiers are trying to kill you and the guys on your side standing next to you. Ambushing them, bombing them from the sky or whatever is not morally evil (nor is it morally good). Its an act of self defence, or the defence of others, when no other option reasonably presents itself to you.
Should your enemy surrender in good faith, you accept that surrender. Should you capture prisoners of war, you treat them with dignity and respect. At all times you seek to minimise collateral damage, and look for ways to end the conflict peacefully
So, if I see a patrol of orcs in the woods, and I am a human (and therefore part of the races that orcs have declared war upon since the time of the gods) then attacking them from ambush and killing all of them before they have time to draw their weapons is morally neutral.
Because it is self defense, and being outnumbered and not knowing how many other orc patrols are in the area to raise an alarm if they saw me running away, then it is a reasonable precaution to save my life.
So, killing orcs on sight, is morally neutral.
Their culture (and religion) is 'rape, murder, enslave'
Yes. Putting a stop to that raping, murdering and enslaving (without resorting to genocide) and converting those rapist, murdering slavers to good people in worship of the Gods of good, is a good act.
More Souls for Heaven. Less Souls for Hell. Both of which exist in (default) 5E.
And the Conquistadors agreed with you. And just about every other European explorer during the age of exploration. "We must stop them from doing evil and force them to do good. It is the only morally just thing to do."
I provided both, but you're being obtuse and resorting to circular arguments and intellectual dishonesty (ignoring what I am saying and forcing me to say it several times) in order to 'win' an argument on the internet.
Modrons, as constructs cant be affected by healing magic (which doesnt affect contructs or undead).
Warforged
WHICH ARE NOT CONSTRUCTS, are affected by healing magic, expressly are called out as 'living' by 3.5 and 4E DnD, and are heavily implied (including in 5E Unearthed Arcana) to have souls:
Do warforged have souls?
My initial point was that Constructs and Undead are not alive. As Warforged ARE NOT CONSTRUCTS, you're arguing a strawman trying to argue that they are (or are not) alive. They're Humanoids; they're not Constructs or Undead.
Like even if you were to somehow prove they are
not alive (despite being expressly called out as being living for over 10 years now through multiple editions of the game), they're not Constructs, so you prove nothing. It would have no bearing on my statement that Constructs and Undead are not alive, and ergo they cant be killed.
But why are constructs not alive? That is the point you haven't been able to give any support for.
Because they are inorganic? So are Warforged. Warforged were just specifically designed to utilize healing magic and healing potions because that made them easier to heal in the war effort.
Constructs can learn, grow mentally, which is a good indicator for life.
You posted a thing about souls? Who says other constructs don't have souls? Modrons live in an outer plane, the place souls go. When they die, another modron is promoted to take their place, and at the base level, a new Monodrone is constructed. Since they are Eusocial this means that effectively, the Modron was brought back to life, their soul instantly recycled and repurposed by Primus.
Also, Raise Dead could theoretically work on a construct, it's only limit is that is cannot be used on an undead. However, it can be used on a dead undead, showing that it is likely just the necromantic magic interfering with the process of the spell.
You are just putting out a statement "these things aren't alive" but you can't prove it, because the measurement of what constitutes "alive" is broad enough that undead and constructs can both be considered "alive".
Osiris Clerics gets the Grave domain, not the Death domain. Says so in Xanathars:
'Deities of the grave include Kelemvor, Wee Jas, the ancestral spirits of the Undying Court, Hades, Anubis, and Osiris.'
Whereas the Death domain says this (DMG):
The Death Domain is an additional domain choice for evil clerics.'
I suppose there is nothing stopping an Evil Cleric of Osiris from having the Death domain (delving into forbidden lore, or a darker arm of the Church etc), although it does appear as if XgTE was removing the Death domain from non Evil deities of Death, however it isnt clear. It's clearly meant as a non evil alternative for good clerics of good (or neutral) death gods though.
The quote even provides the page number. PHB 298