In many cases, families are finding that they have enough money to pay the fines and have the extra children. Local officials are said to even encourage larger families as a means of raising revenue. The way to further the process of reform and liberalization is to increase trading relations, not curb them. That doesn't mean we cannot also denounce human rights abuses. It means that in doing so, we don't punish innocent people in the process.
American consumers benefit greatly from imports from all over the world.
But so do U.S. businesses employing American workers. When the government imposes sanctions, these business are not able to export their goods abroad. This can damage U.S. industry and cost jobs. It's even worse when these sanctions are imposed unilaterally, as they are against Cuba. When U.S. companies are not importing and exporting, other countries step in to pick up the slack.