Believing in corruption doesn't have to be in the same league as believing the moon landings were faked. I don't particularly think this tax thing is something other than short-sightedness, but there is a tendency among some to dismiss even blatant cases of corruption.

Believing in fake moon landings requires believing in a level of competence I don't think exists in large organizations, but the same applies to believing there is no corruption or backroom deals, which are exposed all the time and seemingly rarely punished.