Honestly I think the "nationalistic" right-wing movement simply has the more driven people, who may also be operating outside of the sphere of the regular society, which they deem to be going against their interests. Many of the programmers, underground hackers, or "autists", as I suppose they are now called, are pretty much on board with the so-called "far-right" or "alt-right" or whichever is the preferred media label at the time. Not saying all of them, but quite a lot of them, as far as I know.
The far-left is probably more likely to cause havoc on the streets, unlike the "Nazis in the cellars", but they're pretty much content with just breaking up a few places and that's it. The mainstream media does their job in digging up dirt on the likes of Trump and Le Pen, so there's no real need for individuals to take active efforts to expose their character.
At the end of the day, nobody's going to feel as strongly for voting in favour of a Hillary Clinton or a Macron, compared to a Le Pen or a Trump. If you vote for the latter, then you probably feel quite strongly about it. Strongly enough to potentially do something about it. Especially since the media is not really even trying to play "fair" in regards to your chosen candidate. I don't know what the French media has been doing, but the local media in Finland has pretty much been shitting on Le Pen from day one.
In that sense it is not surprising that the people who support a Le Pen, or a Trump, are more inclined to take matters into their own hands, even to the point of trying to hack into e-mails and such, to balance out the media narrative.
