What do you make of this statement, "A father wouldn't do that to his son."?

I watched a special on the Mendendez brothers. They killed their parents in 1989 when they were 18 and 22.

In trial many things came up. The father’s co-workers testified to a belittling, manipulative, explosive temperament on his part, for one.

The boys testified that their father had sexually abused them when beginning when they were quite small. He sodomized them, they said, among other painful, horrible things.

One of the female jurors said that they were given notepads by the court to make notes on. After the sexual abuse testimony, the male juror’s notepads were just thrown to the floor, and they just quit paying attention. She said you could read the writing on the wall with them, then.

In the jury room she said the men said, “No father would do that do his son.” They just didn’t believe them, and therefore, in their minds, threw out everything they said. The first trial ended in a deadlock with each jury (the boys had separate juries) pretty much down the middle between men and women.

Do you think no father would do that to his sons? I find it a little disturbing that the comment was “No father would do that to his son,” not “No father would do that to his child.”