Jones does make those "non-average" people a lot worse than they would be without his existence. My dad has always been conservative, but it's only been since he started listening to Jones and alt right people online that it's felt dangerous. I don't feel that, had he only ever had access to mainstream media, his political opinions would have ever been this far right.
So I guess you have to weigh whether "won't be taken seriously by most people" is enough of a benefit to outweigh "will radicalize some people and make them out and out neo nazis". My cost/benefit feels like, no, that's not a good tradeoff, but
How many people are actually neo-nazis because of alex jones (and other online personalities), though? I think it's probably a miniscule amount. Furthermore, how many neo-nazis actually engage in violent or illegal activity?
Again - if you accept that the government has the right to decide what opinions are acceptable and which aren't, that immediately affects *everybody* - and suppression of free speech rarely tends to work out in its proponents favour.
My view is basically that isolated violence perpetrated by a few select idiots is much preferable to mass violence perpetrated by the state, which is what you get when you take away free speech rights.