It really depends on what you mean by 'claiming', doesn't it?
If 'claiming' means "We have exclusive rights to it and ET better just watch out", then that's insane. I've also never heard anyone make that argument.
From OP's article:
"It will belong to us. It will belong to humans."
It's a slippery slope.
Replace "space" by "Palestine" and you will have a perfect example of what happens when different groups have different notions of how ownership of physical space is defined.
> "It will belong to us. It will belong to humans."
We haven't found anyone else. Unless and until we do, we're not taking it from anyone. We're just gradually expanding our use of a resource that is currently not in use.
If 'claiming' means "We have exclusive rights to it and ET better just watch out", then that's insane. I've also never heard anyone make that argument.