Free speech has always been a very counter-intuitive process. Opinions that directly oppose yours or even your very person will rub you the wrong way, and to be intent on defending the right of your opponent to voice his opinion seems paradoxical, but we nevertheless conceded that this serves the greater good.
The recent Alex Jones incident was legitimized on the basis of dissemination of dangerous ideas. With Gab, the argument is that it is hate speech. The most compelling argument for free speech is that it removes the subjective and variable limits of speech and by extension, slippery slopes.
If you must know, while I do consider myself a political conservative, I cannot bear to listen to Alex Jones and I've never used Gab. I'm radically free speech which means I enjoy living in a world where literally everyone can say quite literally everything. Whether there is a slippery slope angle to all this is not even relevant for me. I want to hear the ideas of everyone who is broadcasting.
The very arguments I am expounding on are already controversial, but they weren't very long ago. Makes you think.