What makes you think calling someone a child molester is the equivalent of saying you think a shooting was a hoax?
You can lose your job from that accusation. You can get arrested from that accusation.
How is the plantiff injured in any way from some nut on a radio saying he thinks the whole thing was a hoax? Do they lose jobs, money or freedom? Do they lose respect from anyone they care about?
A closer analogy to what you propose would be suggesting someone killed their own kid.
Don't use false equivalencies.
That seems to be a central point, to me.
The families are alleging that they were harassed and threatened, because of what Alex Jones said about them. Yet, one does not hear of the cases against those who harassed and threatened - which really are criminal acts.
Alex Jones is a well known extremist, frequently mocked, and never cited by respected media sources. Therefore, what he says seems irrelevant, and not worthy of damages.