The outstanding question seems to be whether this merits a degree of outrage, not whether we as a society should pass some laws that would protect creators from Patreon.
I know very little about Sargon of Akkad, but as I understand it, his comments were made in a video in which he was being interviewed, not a video that was being funded by Patreon. There's some question about the context of the comments, as to whether he was making them as an example of something a nazi might say or whether they were directed at a particular group. I don't really know.
Patreon's response was that when one of their creators exhibited behavior they didn't approve of outside of their platform (i.e. videos funded through them) that they would demand contrition and be the sole arbiter as to whether that contrition was sufficient.
Sounds worthy of a little outrage to me.