The diversity lottery is actually good immigration policy. Each year you take a sample of average or above average (applicants must have a high school education and no criminal history, and must pass some health tests as well; they must also show they will not be a burden to society once they get in) from countries around the world with historically low immigration rates to your country.
Essentially these are candidates that have self-selected as being willing to start anew in a new country, working hard to improve their lives in the process. In return, your culture is enriched and your economy is boosted by a fresh set of ambitious, hard-working 1st-generation immigrants. Some of these immigrants may go on to become engineers, teachers, doctors, cab drivers, entrepreneurs, nurses etc. But they won't drain your social safety net, they will contribute to it. They're here to work, to make up for lost time, and to make a better future for their offspring. As immigration policies go, I think this is one of the better ones.
Essentially these are candidates that have self-selected as being willing to start anew in a new country, working hard to improve their lives in the process. In return, your culture is enriched and your economy is boosted by a fresh set of ambitious, hard-working 1st-generation immigrants. Some of these immigrants may go on to become engineers, teachers, doctors, cab drivers, entrepreneurs, nurses etc. But they won't drain your social safety net, they will contribute to it. They're here to work, to make up for lost time, and to make a better future for their offspring. As immigration policies go, I think this is one of the better ones.