The problem with this strategy is that the "instant death zone" is much much smaller than the "3rd degree burns over 100% of your body" zone.
I don't share your fatalism, but I can't criticize it. It is an understandable position. With that said, if your desire is truly to remove yourself from existence in the aftermath of such an event it is better to have some plan to do so already laid in. The majority of immediate casualties will not be deaths, you are very likely to regret relying on the weapons.
That would also grant you the chance to reconsider whether the resulting world is actually not worth living it -- or at very least to confirm that it is in fact so bleak.
I don't share your fatalism, but I can't criticize it. It is an understandable position. With that said, if your desire is truly to remove yourself from existence in the aftermath of such an event it is better to have some plan to do so already laid in. The majority of immediate casualties will not be deaths, you are very likely to regret relying on the weapons.
That would also grant you the chance to reconsider whether the resulting world is actually not worth living it -- or at very least to confirm that it is in fact so bleak.