We need to find tools to separate the abusers from those who use the system to get back on their feet.
The rat study done in France seems to be bad science. Dr. Steven Novella in in NeuroLogica blog among others listed the problems with the study. There have been many, many studies testing GMO corn safety. This one is definitely making some extreme claims. I would be willing to bet that larger, better designed studies will follow that will contradict this one.
Scientifically literate environmentalists should consider the logic of people like Steward Brand. He is a long-time environmentalist who advocates GMO's, nuclear power and dense urbanization -- all to limit the negative impacts of human activities on the environment.
No breakthroughs in physics or engineering would be needed to build O'Neill cylinders that could eventually create habitable land areas several times that of the earth.
So we can't claim it's impossible. Maybe we'll never do it because, as a species, we can't seem to stop wasting talent and energy on killing each other over borders and religions -- But not because it's impossible.
By the way, an O'Neill cylinder is used in the new hard science fiction web series "L5". They only tease you with a few glimpses in the opening episode, but if they get enough support, they'll make more.
Unless, of course, you subscribe to the pessimistic view that we are inevitably going to see the collapse of civilization and the return of illiterate barbarism. In which case, I would suggest that you are focusing on one of the smaller risks in that post-apocalyptic world.
My suggestion would be to find a way to safely store them for 50 years. If, at the end of that time, we still haven't found a better use for the "waste", then we repackage it for the next 50 years using the superior knowledge and technology that will then be available.
Experience shows many more lives will be saved by applying technology than we could ever hope for by depending on people to behave properly.
As to your broad assertion that anyone claiming anything done for the children is lying, I know that to be false. (The way you framed the argument only requires a single counter example). My wife has been teaching for many, many years and I have been a part of decisions she has made to confront parents, argue with administration and generally do things not in her self interest. On those occasions it has been for the good of a child.
Back in 1976, Princeton Prof Gerard K. O'Neill and a NASA sponsored study designed some alternatives. Human colonies in space
>>>As for asteroids that caused massive extinctions, the previous one was 70 million years ago. And 250 million years ago. During that timespan we evolved from small rodent-like lizards into modern mammals. Who knows where we'll be in another 70 million years.
This is the kind of guy that should be looking for building opportunities after a "hundred year flood event". After all, he's got another hundred years without a flood. Right?