The selectee letter clearly states that being selected is not a guarantee of receiving a Green Card. Their job is to allocate visas to all who are eligible, according to cutoff numbers and case numbers, and all that UNTIL the various limits are hit. They are doing their "damn job" - exactly as the law has specified. THAT is it.
Than the law works to destroy dreams slowly, month by month, for an entire year, for some being simply a disappointment, for others in specific situations becoming a nightmare of incredible proportions. The people who made the law will never know how much life-changing damage they have done.