I agree. I still think the mob did it for some reason.
Putting out the story that it was just a family fight sounds a thousand times better than admitting that Harry has dealings with unsavory people.
I agree about it being the mob. Didn’t Harry box in his younger years? Wouldn’t he have been able to defend himself from his little brother, especially with Secret Service guys around? If he was dealing with the mob, he wouldn’t have any SS guys on hand to witness the event & he’d be more likely to get hammered by a younger man.