> To paraphrase: "Ideas are dangerous"
More precisely: ideas are powerful, which means they can be dangerous.
Anyone who doesn't understand that is actually a deeper enemy of discourse than a platform owner who says their forum is not a venue for topic X or opinion Y.
Some stop here at a dichotomy: "you want to ban ideas, I will be oppressed!" or "I must literally be allowed to put my words in your speech vehicle and be given full access to its audience without any abrogation of that privilege or I am being oppressed!"
Others start to understand what the legal system has with both weapons and speech: perhaps there are some activities or forms it takes that need nuanced consideration. Time, place, manner, associated behavior, fire in a crowded theater, threats, etc. You will find these considerations where people actually take speech seriously.
> Ideas are dangerous, people cannot be trusted to argue on the internet because it leads to violence
You seem to be merely summarizing with scorn here rather than actually addressing the situations where this happens.
It's not hard to find stories where distorted worldviews oriented around agentive threats regarding the pandemic have led to people threatening and even assaulting health professionals. I know some of these people.
You probably know families or acquaintances that have banned certain topics from dinner gatherings because they lead to heated conversations or even violence. It's not that they believe no one should ever talk about them. It's that they understand what Wong is talking about here: there's problem behavior and carving out a domain where the related topic isn't carried is one way of fixing it.
And when it's your house that people are yelling or coming to blows at, I'll bet you try the same solution.
Arguing on "the internet" is a freedom that has never been threatened by limitation that Twitter and Reddit have put in place. What's at stake with Twitter and Reddit is what Wong describes well here: they're stewards of the platform where this is taking place, they get to see the effects. They feel an obligation to do something about it.
And you know what? Their right to do so as stewards of the platform is also a freedom of speech right. And it's every bit as important as an individual's right to spout off about whatever it is they want.
The freedoms to watch more strictly are those where the state or other entities impose violence or loss of physical freedom as a consequence for touching a topic. Twitter and Reddit battles are about people's sense of privilege.