Again, you are assuming fault upon him without knowing for a fact what was in his head.
When I signed the DNR I actually FORGOT my wife's living will wherein she already said she didn't want to be resuscitated. It wasn't until several months after the funeral when I came across it and remembered. I was glad I didn't violate her wishes.
Not really. It is well-established in the rules of evidence that hearsay carries much more weight if expressed when it is first an issue than years later.