Is it possible for an American immigrant visa to be refused? Under what circumstances will I be refused a visa?

Ordinary investors' application for an American immigrant visa was rejected. The possible reasons are as follows:

1. The identity or background of the applicant is sensitive.

2. The applicant submits false certification documents or there are deceptive acts such as fabricating facts.

3. Because of economic guarantee and other reasons, the applicant may bring public burden to the United States after immigration.

4. Other acts that the U.S. government considers unsuitable for entering the United States, such as criminal offences.

5. The applicant suffers from infectious diseases or some chronic diseases that require high treatment fees, such as AIDS, tuberculosis, syphilis, etc.