Hammond is to blame for Sam not trying another address; she has hypothermia as an excuse.
He should have, as part of a risk assessment, have considered the possibility that an SG team might urgently need to leave a planet where they are under fire from hostiles, but not want to come to the SGC, or not be able to. If the Jaffa chasing them had shot and damaged the GDO, if the Earth gate was in use at the time of the emergency, or if the DHD didn't have the right symbols then they ought to have a 'spare' address, possibly the Alpha site, possibly an empty and harmless planet, where they could regroup and sit tight until they can contact Earth or Earth come to find them.
Or if they needed to get out fast but they were themselves a danger to the SGC due to some contagion. Like in Bane, when the bugs were chasing them, it would have made more sense for them to dial a 'spare' planet.
Not really Hammond's finest hour. But Solitudes was such a great story that I'll forgive him. Just.
