That was pretty much the narrator's conclusion:
"poor Lake, poor Gedney... and poor Old Ones! Scientists to the last - what had they done that we would not have done in their place? God, what intelligence and persistence! What a facing of the incredible, just as those carven kinsmen and forbears had faced things only a little less incredible! Radiates, vegetables, monstrosities, star spawn - whatever they had been, they were men!"