Accelerationists believe that the only way for a new political/social system to emerge (Communism, Fascism, whateverism) is to accelerate the downfall of status quo. So instead of engaging with the system and trying to change it, they try to enhance the worst aspects of it in the hopes that will drive people to (generally violent) revolution.

It is obviously a niche ideology you rarely run into offline, and when you do it's generally young, mentally ill, or simply very damaged people who can't imagine life ever getting better without the world burning first.