I've seen a few anti-Trumpers just become bog-standard Dems, which I welcome, but, yeah, it doesn't seem like there's any concession that could actually win over the people who won't, so why try to make any?
They hate Trump because they believe what their own eyes and ears are telling them, but everything else they consume in their daily lives is stridently anti-Democrat. It all leads to a ton of hemming and hawing and a generally pissy mood.