The Vietnamese name "David Dao" is very common and the Daily Mail did not do their research. The doctor on the plane is named David Thanh Duc Dao, MD. He has 4 children (all doctors) and his wife, also a doctor, owns a clinic south of Louisville. He has no criminal past of any kind.
The OTHER man with a criminal past, who lives 60 miles from Louisville, is named David Anh Duy Dao. Similar name but different person.
United has been running a smear campaign against Dr. Dao to ward off bad press and potential lawsuits. They misidentified him as a criminal, and the Daily Mail reported the misidentification without vetting the story.