One of the most common tactics used by conspiracy theorists, all types of denialists, creationists and other such people is the shotgun argumentation: They amass huge amounts of arguments and "evidence" of a hoax (or whatever). It doesn't matter how small or ridiculous the argument might be, everything goes. The important thing is the sheer amount of them. Quantity over quality.
Does anyone else sometimes get a feeling of being overwhelmed by this rapid-fire of argument after argument after argument? For example, just write "911" or "moon hoax" into youtube and you will get hundreds and hundreds of conspiracy theory videos. Many repeat all the same old tired arguments, some present "clever" new arguments, but they are just so many that it's like an avalanche. (In gaming parlance this could be compared to the concept of "zerg rush".)
One quickly develops a kind of "skeptic's fatigue": In other words, one gets tired of this enormous flood of stupidity, and stops caring. Whenever a new video or web page promoting some conspiracy theory, denialism or creationism comes up while surfing the internet, the fatigued skeptic just skips it. "Argh, yet another one of those. Who cares? Not me, that's for sure." (It certainly doesn't help that some of those videos are like 2 hours long, and full of stupid from beginning to end.)
It doesn't matter how much the claims are debunked. For each debunked claim 10 new ones are crafted up. It's like the Hydra.
I fear that because of this, many of the claims go unchallenged and unexplained. This, of course, is taken as a sign that the claim has no explanation (other than it being a sign of a hoax).