The fact that a criminal is still the favorite candidate of law enforcement around the country says something profoundly disturbing about our system: Ever since Donald J. Trump issued a series of pardons and commutations as he left office, he and his allies have defended his administration’s vetting of clemency candidates, claiming they went through a vigorous screening process. But the case of one of those convicts — a New York drug dealer and predatory lender named Jonathan Braun, who had a history of violence and faced an array of other legal problems — has stood out and raised doubts about how rigorous the vetting was. On Tuesday, the police on Long Island arrested Mr. Braun after he allegedly punched his 75-year-old father-in-law in the head. Mr. Braun struck his father-in-law twice as he tried to protect his daughter from Mr. Braun, who was chasing after her while the couple had an argument in their home, according to the Nassau County District Attorney’s office. Mr. Braun’s wife, according to court documents, told police that Mr. Braun had assaulted her twice in the past five weeks. On July 17, the court documents said, Mr. Braun threw his wife off a bed onto the floor, “causing her substantial pain and bruising her legs.” Last week, on Aug. 12, Mr. Braun threw her to the floor and punched her in the head multiple times “causing her substantial pain, bruising” to her arms, legs and head and causing her to feel dizzy, the documents said.…