I'm not sure that David Icke is the most credible of commentators. He seems to pounce on anything at all that's out of the ordinary and stick it all together into one massive, confusing ball of complexity and assumption.
The "governmental incompetence" argument only works if one assumes that the whole, or at least a large proportion of the government was involved. As I have said elsewhere, it only takes a few key people (not just in government but across several power bases) and the compartmentalization of duties/knowledge. To say that governments can't keep secrets ignores things like the Manhattan Project, which employed thousands of people in dozens of facilities across the US and Canada, set off trial detonations and lasted for around six years with nobody in the general public being any the wiser.
