Greer's motives for his rulings are not available to the general public at this time. They would require some digging.
I hope there will be an explanation of his motives some day.
Meanwhile, Greer has talked about the case publicly, to the press, much more than he should.
Greer's a gabby guy, all right, and acts like he deserves to talk openly about the case when he wants to.
That's how we know he thinks Terri should only be judged for her current condition, not how she was in the past.
Then again Greer is secretive when he shouldn't be, like when he secretly arranges for higher fees to come out of Terri's money to pay Schiavo's lawyer, George Felos.