Should drunk driving be legal as long as you don't crash?

Drunk driving has a reasonably high likelihood of physical harm, as does yelling "fire" in a crowded theatre.

Posting opinions about current events on a message board is not likely to cause physical harm.

What Stallman did isn't illegal. So some legal standard of likelyhood of physical harm need not apply. But I dispute your claim that rape apologia by an authority figure is unlikely to cause harm.

It was the grandparent's example, not mine. Also, I dispute your characterization as "rape apologia". It's a fairly ironic description given RMS's original issue was mischaracterization of the issue in the media.