Because too many people start with a flaw, they have a conclusion determined, then look for any evidence to support that conclusion. In this case, Donofrio had to go all the way to British Common Law to find his support because US law, specifically Title 8 which defines citizenship, doesn’t back him if Obama was born in Hawaii.
He compounds his nonsense by claiming McCain is not natural born which turns law and justice on its head and confuses “natural born” with “native born” another obvious point.