However, this has done nothing to relieve my ongoing anxiety over Apophis...and the governments capabilities to have any calculations correct, or, whether they would let us know the truth if the news for either 2029 or 2036 is bad.
The problem with the orbit of Apophis has nothing to do with butterflies and everything to due with garden variety second order uncertainties. Apophis will not hit earth in 2029. By 2029 we will know whether or not it will hit earth in 2036. The information will be so widely available that no government could hope to hide the fact.