You're utterly certain what the truth is, so why ask for anyone's input?
Because I would like to know whether you believe the IRS is hiding something or not. Why is that such a tough question to answer? I think you do believe the IRS is hiding something, but you just don't want to throw out something that could possibly be seen as going against your team in any light at all.
No matter how obvious something is, if it goes against your team, you have to do all you can to offer a defense. And when it's rather obvious there is something wrong, you hide from admitting it.