Well, cause in between now and the day you croak, there could be a lot of good stuff too. But there could be a lot of shit also. It's usually a mixed bag, so you might as well live through it and see what happens. Death is an easy way out. Well, spite becomes useless.
Vengeance is pointless.
In very rare circumstances is vengeance a necessity. You should use your energy for something more productive. Its normal to feel like you wnat it, but its just a feeling. The best revenge is living well. You suffer through it and you live anyway.