Because the arguments are extremely weak.

The only one that even remotely makes sense is the evidence that the moon landing
is fake (and I agree:  I believe the moon landing was fake).

But you cannot jump from "Nasa lied" all the way to "the earth is flat" because
one thing doesn't imply the other.   

It's a ridiculous non sequitor.  It would be the equivalent of saying "we know the
9/11 towers were a controlled demolition, therefore there's no such thing as airplanes."