> I also fail to see how dumping our waste on generations to come for our own selfish desires is less bad.

You're assuming that just because we consider it waste, they will too. Personally, I'm expecting that at some point some use will be found for the 'waste' -- maybe highly efficient reprocessing or materials for low-radiation (think 'easily traced') medical nanobots -- at which point future generations will thank us profusely for generating such convenient stockpiles of the stuff.