I don't think its blind/ignorant to think that way for some things.
For things that we are tossing away when we are done with them, as long as we mark where all our dumps are, the future generations should be fine as when they run out of an element, they will be able to mine our dumps. Its not like we are destroying the elements to build things out of them.
We could be nice and somewhat sort/record the trash in our dumps so future generations know where to dig when they need something and be able to get it in reasonable concentrations.
For things that we are tossing away when we are done with them, as long as we mark where all our dumps are, the future generations should be fine as when they run out of an element, they will be able to mine our dumps. Its not like we are destroying the elements to build things out of them.
We could be nice and somewhat sort/record the trash in our dumps so future generations know where to dig when they need something and be able to get it in reasonable concentrations.