No, I would not want most of the world destroyed by nuclear war. That's the same thing that the extremist Islamists, like bin laden, want. They think that allah will then start over, putting them in charge.

Additionally, if most of the population were destroyed, there would be so much fallout that it would be impossible to live.

I would rather see the human race not procreate, and die off with dignity - leaving the animal kingdom a chance to produce intelligent life in the future that is, well, "intelligent". This is called the "Voluntary Human Extinction Movement". http://www.vhemt.org/

"May we live long and die out"
"Phasing out the human race by voluntarily ceasing to breed will allow Earth's biosphere to return to good health. Crowded conditions and resource shortages will improve as we become less dense."

By remaining child-free, you can help achieve this goal.