I don't care about nuclear holocaust in my games as long as
1) It is interesting
2) It touches not only one civilisation. In fact, nuclear world war would cripple everyone, no only the victim. If enough atomic weapons would be used to cause one empire to lose 90% of its citizens, it would mean that the whole world would go to hell after it, because of nuclear winter
Personally I LIKE when warmongers kill peaceful civilisations. Why? Because things like that makes the game interesting. I wouldn't play civ if it was game only about
peaceful empires building cottages, this is not SimCity.
At the same time, when I am peaceful nation and Shaka slaughters his entire continent I am 'furious in a positive way' - I am furious because he is a villain, but this fury is 100% positive because it means I am really engaged in game and interesting things happen
One time I was playing a game when there were two continents: first, peaceful and very developed, and second, which had Shaka
I was 'furious' because the entire history of this second continent was one great struggle against Adolf Shaka and he was exterminating lots of beautiful cultural cities (I will never forget 25 citizen Chichen Itza with all its wonders... SLaughtered by him...), but in the same time this game was one of my favourites - my best games are with great warmongering AI, because they tend to be very interesting and very challenging.
There was only one time when I felt bad about killing AI - when I was Netherlands and allied with Zulu to kill peaceful and friendly Shoshone
Yeah, that was evil
Machiavellistic justification: I really, really needed to do that because of geography and lack of terrain to expansion.
Hm, I have to launch the game as Mongolia on Earth TSL map, download some mods including 'May Burn Capitals' and do nothing but slaughter peaceful nations, betray friends, burn great works of art and literature, ruin cities with countless wonders, cut all forests, nuke everything including Amazon Jungle, massacre civilian population, don't take prisoners and make women of conquered nations suffer