Reddit has already shown that they had the capability and the will to edit users posts, not just removing them. Reddit and other social sites already uses all sorts of algorithms to move content they want to the top and to bury content they don't want. Companies don't want negative PR about themselves or their products. Companies advertising on Reddit are Reddit's actual customers.
You put those facts together and being afraid of Reddit eventually censoring posts critical of customers doesn't seem like fallacious thinking.
You don't throw a chicken into a cage with a starving tiger and call it a slippery slope to say that the chicken is going to get eaten
This is a lie. Hate speech is not illegal, and the SCOTUS has explicitly made this clear.
To not have an understanding of the critical importance for private individuals to speak freely shows an extraordinary lack of knowledge of history, for one. And you declare you are an attorney in your HN "about" page?
They're the same concept. And that concept is also in physics. "Things in motion tend to stay in motion unless acted on by an external force".
As an aside, there is something called the "fallacy fallacy" wherein pointing out a fallacy in someone else's argument doesn't necessarily mean that the argument's conclusion is false.
With that said, I'm not making an assessment of the above poster's reasoning.
It already is. Even if you removed the mods, the hive-mind would moderate unpopular ideas to oblivion anyway.
That is a dangerous road. Today they might be taking down otherwise legal content with which advertisers do not want to be associated. Tomorrow they are being asked to remove content with which advertisers disagree. Suddenly my 1000-word rant on the evils of Microsoft's latest OS is being taken down. Rather than being a free space for discussion, reddit will have become just another moderated online forum where nothing of note ever happens.
Reddit's power comes from negative posts. Facebook and twitter makes headlines when people 'like' things a billion times. They lack the capacity for users to express anger objectively. Reddit makes headlines when it empowers 50,000 gamers to dump on EA. Advertisers like EA should be be paying for such feedback. They evidently already listen to it.