How has doing nothing against the rise of fascism worked so far?
Dismantling bad ideas through debate, exposing their flaws, and addressing the root psychological and economic causes of extremism isn't "doing nothing." It is doing the actual, difficult work required to maintain a democracy.
If you want to know why authoritarianism is actually on the rise, it isn't because society has "too much free speech." It is rising because of corporate capture, oligarchy, and the systematic destruction of the working class. When a society’s institutions fail its citizens, and those institutions then attempt to censor and suppress the resulting public anger, desperate people turn to extremists who promise to tear the system down.
By cheering for censorship and street violence, you aren't fighting the rise of authoritarianism. You are helping to create the exact polarized and violent environment it needs to thrive.