Alternative Character Interpretation: Beside the issues brought up under Space Jews, there has been some speculation that Arizona Wilder, the primary informant on The Reptilians, was a government plant, intended to introduce the alien angle as a way of discrediting Icke's findings on secret societies and political corruption.
Paranoia Fuel: Icke comes off as quite lucid and seems to be perfectly sane; even the most hardy skeptic can be drawn in and start to wonder What if....?
Right up until he explains that his sources include people high on LSD, at that point most skeptics feel safe deeming him unequivocally wrong.