Just to be clear I'm not trying to be hostile either, if my post came off that way I apologize.
As for the second part, I think it's obvious Trump has dementia too, but I don't think I, or anyone here, has facts to support that. I provided the reasons why I believe what I do about Biden, and I'm sure most people here have seen the unending stream of Biden clips as well as his debate performances. I think I've watched all but 1-2 debates this primary season so my viewpoint is not solely based on things he's said at campaign events. Ideally I wouldn't have to vote for anyone who is as old as Trump/Bernie/Biden/Warren/etc.