If it is impossible to have off-diagonal results, that is a much stronger argument for cooperating than having it be improbable
If the probability is epsilon, then having the probability be zero is only an epsilon stronger argument. If you doubt this let epsilon equal 1/​googolplex.
If the probability is epsilon, then having the probability be zero is only an epsilon stronger argument. If you doubt this let epsilon equal 1/​googolplex.