That's just thought-terminating. There's no universal truth that ends do or do not justify means.

Is locking up a sex offender to prevent further victimization justifiable? Is taking bread from a store to feed a starving person justifiable? Is banning false advertisement justifiable? Is requiring licensure for medical practice justifiable? Those actions are all means that directly violate some conception of liberal human rights.

Additionally, there's often not a clear delineation, in the real world, between means and ends. The real world is made up of complex networks of powers and interests competing against each other, regardless of what can or cannot be justified. We believe in advancing working class power, interests, and rights, which by definition necessitates undermining the power, interests, and rights of the ruling class and its enforcers/enablers. Within that framework we accept and perform criticisms of the methods used to progress those goals, but only inasmuch as those critiques can help to refine strategy and inform future liberatory movements. Otherwise it's either carrying water for US interests or squabbling about the moral standing of dead people.