1) Remove rape from this list. It is nowhere in the list. I won't engage in this kind of talk.
As vile as Rape is, Genocide (a word you used, in your OP, as something a Good person can engage in) is a magnitude of degrees worse.
As for genocide.
In our real world, I fully agree with you.
In a medieval world where there are many races and gods walk the earth it is an entire other matter.
Consider this. The Orcs of the Broken Skull tribe have raided the kingdom for the 10th time. They descend from their mountain adobe. Kill hundreds of innocents, pillage, rape and zounds of atrocities. You're a Lawful Good paladin and you are ordered to lead an army to eradicate (read here genocide) the Broken Skull tribe to the last living representative.
Presuming a LG Paladin of Torm?
I deny the orders as unjust and evil, and refuse to participate in them.
I instead implore my liege Lord to first allow me to seek an audience with the King of the Broken Skull tribe, under truce, to discuss terms whereby the raids stop, in exchange for vital trade exchanges between the nations. Instead of plunder, perhaps the two nations can come to some terms where they can live peacefully with each other.
(This was how the Vikings were stopped by the way (seeing as you want to continue to throw medieval terms times at me). The French and English just let them stay, granted them land to farm and so forth, or tribute under a vassalage ystem). Its where Normandy and the Danelaw came from.)
In other words, I first use all such reasonable methods to end the conflict without bloodshed.
If such a truce fails or the Orcs refuse negotiations,
and the Orcs are raiding (or just about to raid), I lead an army of men to meet them in battle, using decisive force to stop them until they surrender, or are driven back.
If even
more decisive measures are needed (for example, the Orcs have a habit of simply regrouping and re attacking over and over again, are known Gruumsh worshippers, hold prisoners or slaves of the people I am sworn to protect etc), I then ride into their head town or encampment, capture or kill their chieftain (if he refuses surrender), free any captured people, and establish order, placing a new leader in his place (an Orc or Half Orc of good alignment, or one that is amicable to a treaty or friendly relations with my liege Lord would suffice; failing that an Orc that thinks trade is preferable to occupation and martial law). I outlaw the worst practices of the worship of Gruumsh and other Gods of evil (practices such as Slavery, Murder and Rape) and leave a garrison of my men in the town to maintain order.
I treat all prisoners with mercy, kindness and respect. I ensure they are fed and treated as well as my own men, and give them the medical attention they need. I free them (disarmed of course) and let them return to their families as a sign of Torm and my Lords mercy.
My men are under strict orders not to plunder, mistreat prisoners, rape, or harm civilians. They are to act as a beacon of good and hope.
I also ensure my Priests (who are tending to the sick) seek to convert to my faith as many Orcs as are willing to do so of their own accord, and see the light of Torms words
No, you're giving me a false binary. It's not an 'either/or'. It never is an 'either/or'. These ridiculous alignment hypotheticals are always reduced to two options (both of them evil). It's stupid and doesnt reflect the real world.