Nobody assumes revolution will be smooth and painless, what's important is that it's necessary for a better world. We have to work as hard as we can to make sure it works out as smoothly as possible.

Okay, let's look at the results to far:

Revolution: Takr away window dressing like culture, and the crushing majority of earth's population share our class interest. Most humans want to live in a society focused on taking care of humans, and many revolutions have succeeded or even flourished despite full-spectrum seige from the capitalist bloc.

Reform: reform has been tried for a hundred fifty years and all there is to show for it is two and a half world wars, many capitalist genocides, and an entrenched neo-aristocracy of openly fascist, pedophile death cultists who have kicked off a mass extinction and are driving us towards nuclear apocalypse.

Every communist revolution that survived the 20th century is now either absolutely thriving or at least weathering extreme US seige, and the ones that weathered their seiges already have begun to thrive (see the DPRK). China is currenty the best hope for the survival of any large scale human civilization.

Meanwhile, every capitalist society where people chose reform has backslid or been backsliding into fascism. And at this point, we are out of time to keep trying gentle .methods. Capitalism is the cancer killing the only extraordinary gem of a planet where plants grow and creatures roam, and it's in part thanks to the history of denial of how bad it is, the continual, suicidal insistence on taking half measures in the face of overwhelming warning that has allowed it to metastasize to such a horrifying degree that our only options now are the risky, painful surgery of revolution or certain death.