Nay-sayers all want explanations for the flapping flag, the lack of dust, the radiation, the apparent full gravity, and many other issues from the moon landing videos. Scientists have answered each one, but the scientific explanations are never good enough to entirely cover the doubts. What makes sense to a scientist, doesn't completely explain away, without any possible refutes, an intentional hoax. When it comes down to it, it's entirely a matter of opinion. Any individual's experiences might lead to one decision on the matter, while another's experiences and attitudes would lead to the exact opposite decision.
Belief is entirely a matter of perspective.
Quite frankly, there's probably no real way to totally prove or disprove any one individual's beliefs. There can be arguments both ways. This is similar to the controversy that argues that the Earth is flat, and those that refute that concept. There will always be individuals that support the scientific evidence that says there were real lunar landings, just as there will likely always be individuals that poke holes in the science and say that it was all a hoax. The big issue becomes whether public opinion begins to affect funding for science programs.