ASSUMING HE HAS ONE, what's going on in Joe Biden's mind?

I tend to think the motives are these:

(1) Whatever Trump did, do the opposite. This is in part reflexive and in part spiteful.
(2) Whatever Obama did, do more of it and go that extra mile.
(3) Virtue-signal to your leftist base and give them what they want,
     or you will lose them.

Even now, with this Russia invasion of Ukraine, they’re not going to reverse direction.

Fair, and accurate. -