There is no possible way that someone ranting on the internet can cause 1.5 billion of emotional damage or whatever the claim was.
In particular, the libel (and it should be libel, making claims that are not true, rather than 'defamation' which is merely slurring them), should be from a credible source. Alex Jones is obviously not a credible source in this, or any case, and is unlikely to have caused any material harm (loss of jobs etc) to the 'victims'.
I mean, good riddance to Alex Jones, but the tools and methods used were entirely inappropriate to a liberal democracy, where you prevail with better arguments.