This is a situation in which the Committee could have (should have?) defined the downed tree as GUR, in which case you would have been able to take free relief. In my group of friends, we'd probably play it as GUR in a casual game. Otherwise, a completely detached fallen tree is a loose impediment, you could have moved it (if possible) or even broken off part of it in order to make a swing. If its still attached to the roots, you simply cannot do anything about it.
But a question, in taking Unplayable Ball relief, couldn't you have gone back on the line and found a place where you could swing? You don't have to take Lateral Relief and stay within 2 clublengths.
Last year some serious wind took down a tree and it was laying horizontally. Played that course a lot, for golf reasons, that day was the first time I ever hit one anywhere near that tree. Because of course it was. It was under the fallen trunk/branches so much that even after taking an unplayable and relief I had no swing. It felt really dirty but the guy I was playing with said the fallen tree didn't have any option for free relief and since I had not realized it was under the tree from the box, and did not want to do the walk of shame on the first tee with multiple groups waiting...ugh. Sometimes the rules feel penal, but then I remember I am the one who made the sub-optimal swing in the first place.
We are entitled to nothing from Tiger and that is what we will get. Tiger's branding is strong and a non-statement is probably his best strategy.
As taxpayers, we are entitled to whatever accident reports and investigations were done by the public agency under the public records laws of California.