Joe Biden is not a "decent" man.historian said:
My grandmother lived to be 99 and was still lucid to the end. My Dad lived to 87 and was doing well until a few years before the end. No two people have the same experience. The difference is that most people when they have dementia withdraw from public life and the family helps them in every way. Think of Bruce Willis.
I feel somewhat sorry for Joe Biden is a victim of elder abuse, the ultimate example today. On the other hand, even before his mental decline (30-40 years ago!) he was corrupt & evil. And that's based on what we know. Who knows how many of his crimes were covered up more successfully, like the Clinton's & Obama's (& maybe the Bush's).
This was in 2012 when he was 100% lucid and there are lots more examples of this pattern.