The atmosphere is so heated, and the statements are getting more and more extreme. Let’s just assume Harris wins the election. After a campaign like this, how could you ever have a normal relationship with your pro-Trump neighbor/father-in-law/Uncle/Barber or what ever again?
Faithless electors have happened a couple times historically.
If there is ever a legitimate use for its absurd existence, it would be in an effort to stop a literal fascist.