Probably this is not that bad that species which can't manage to sort things out with their own planet are not able to reach other worlds. This is sort of a nat

Probably this is not that bad that species which can't manage to sort things out with their own planet are not able to reach other worlds. This is sort of a natural quarantine. Actually I suspect if we knew the attitudes and histories of the other civilizations similar to ours we would be grateful the interstellar distances are that big.