Why is Granpa so disappointed in George Washington? Chapter 3

They seem to defy his sense of logic. One night Granma reads about George Washington, which greatly troubles Granpa.Little Tree mentions in the narration that, years later, he discovers Granma only read the good parts about George Washington, not the parts that told how he killed Indians, so Granpa would have someone to admire. Granpa has a big distaste for politicians or any people in positions of authority, who he refers to as 'the law'. Granpa wonders if there could have been one good person in politics; but Granma slips up. She mentions a time George Washington was going to put a tax on whiskey makers and decide who could or could not make whiskey. A whiskey maker himself, this disturbs Granpa greatly.