Comment Re:Simple? (Score 2) 34
Perhaps the simplest answer is to not assume any human is infallible.
No one seriously working in Cosmology does that. Indeed, there are a lot of theories out there trying to either displace or at least amend Einstein's General Relativity, like MoND or TeVeS. The problem: No one until now has come up with a good idea how to do it, and all the proposed alternatives don't work very well either, have to assume even more unknowns, or are outright wrong in places where GR has been shown to work. Until then, we continue to use GR, because we know, where it works fine, and we know, where it fails.
It's easy to sit in an armchair and wandwave some theories in existence which superseed General Relativity. It's really hard to actually write them down.