I think you hit the nail on the head. It is becoming clear to me that what Cindy hates most, is herself. Not only does she feel responsible for not being able to stop her son from enlisting...but if she's held these same attitudes (being from Berkeley) her entire life, she may have helped push her son to the career he chose.
Children are often rebellious; and it wouldn't come as a surprise to me if this was Casey's way of showing his independence from his obviously opinionated mother. Only Cindy knows the truth; but if there is any truth in this, her outrage is about what she did...not Bush or anybody else.
Another BIMBO Alert?