There's a few sides. Sometimes giving the moderator too much power means they also have too much power of abstention. If they selectively don't enforce rules, toxic behaviour can be enabled. Worse when rules are enforced against one participant but not another. Sometimes vague rules get arbitrarily used against the unpopular.

When those mods are literally playing a role in it and removing posts from one side of the political argument, but not the other side, in that discussion then yes they are part of the problem.