That's only true if there is a downvote threshold that automatically hides downvoted comments, which I don't think Lemmy has implemented. I agree that downvoting can be used to censor and avoid discussion, but the justification for removing downvotes on Beehaw is something like "keeping a positive environment with no negativity from disliking" rather than making sure users have to voice their disagreements and not just smash the blue red arrow like cowards.