I don't know anything about Alex Jones other than that he is on the fringe. People on the fringe can mostly be ignored unless they become dangerous, and they do so be acquiring significant power and influence. The difference between the extreme right and the extreme left is that the former has virtually no political, cultural, or other power in our society, while the latter is ascendant and yields vast amounts of power today.

The comparison is not remotely apples to apples. The extreme left is the greatest existential threat to our society today. The extreme right is a joke.