So far all we know (or at least are led to believe) about the group is they have children and two guys who may be brave but not exactly the toughest people in the world.
I think it's opposite to the recent groups we've seen, they aren't a threat to Rick group - rather Rick's group is the threat to them.
Like Aaron said, he was willing to risk himself but not his group. I think it's because it consists mostly of children and other 'weak' people and he didn't want to give up that his town was undefended and weak. He wants Rick and his group for protection because they are the fighters that the town lacks.
Although the barriers put up would have had to been put up by capable strong adults which ruins the thought a bit - maybe the fighters and muscle died somehow.
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