People who don't fear physical violence make this argument all the time. They don't know why it's wrong, because again, they do not fear violence. Speech is just things on the internet, that aren't actually real.
They don't get doxxed, they can't be identified in a crowd, they can blend with whatever the majority is.
It is very easy to defend "free speech absolutism" when you're not the target of hate speech. When you're not the target of harassment. When no one is declaring that your rights should be removed, that violence against you or one of your group memberships should be acceptable.
"We just need to have good arguments" is something said by a person who's participation in the discourse is entirely voluntary, and who's stakes aren't "I have a right to make decisions about my own body", "I have a right to live unharassed in my private life", "I am equally entitled to life, liberty and the pursuit of happiness".
"Free speech absolutism" is something only ever advocated for by people who don't have to care about what that speech is advocating. Who have the privilege to turn a blind eye to stochastic terrorism, and will argue out one side of their mouth that "police have no duty to protect you from crime before it happens" while arguing out the other "well a few bad actors should be dealt with by the police".
Meanwhile, in the real world - bomb threats to children's hospitals[1].
[1] https://www.theguardian.com/us-news/2022/aug/31/boston-child...
