Well, since the last two world wars almost wiped out an entire generation of people and we now have more powerful and destructive weapons, its not like it's going to be any better. All wars are a bad thing no matter how you look at it. Then you also have to consider the civilian casualties. There would also be large scale global homelessness since it is a world war. The likelihood is that it would kill most people around the world due to lack of medical care and rapid spread of disease from lack of sanitation. So tell me now how ww3 wouldn't be a bad thing.