Why is Joe practical?

Middle aged and prosperous, Joe Keller is a family man whose world does not extend beyond the borders of his front yard or the gate around his factory. He is not a greedy, conniving caricature of capitalism, but rather a good-natured and loving man of little education, whose myopic perspective on his world stems from a devotion to his family and an education in a society that encourages generally antisocial behavior. American rugged individualism alienated Keller, whose past misdeeds haunt the future of his family.