Perhaps the elderly in the UK... no, honestly, I don't know how to respond to this, except to say I've never seen anything even vaguely like this first-hand ever.
It's one thing to confuse pedals (which I'm sure does happen though again I'm not sure that I've witnessed it), it's another thing entirely to drive up steps (I would have thought that most people would feel a bump, think "hold on.." and stop), break an open door (ditto), then attempt to drive through a completely blocked area (wha?), and only stop driving after crashing and
when one can't go forward any further (although to me it looks like they're still trying to go forward even after crashing into the car).
Are you honestly saying that you've seen someone do something very similar to that, first hand?
Out of curiosity, does the US have a similar law that the UK does, that someone over the age of (I think) 70 has to re-apply for their driving licence periodically (health/eye checks I think are part of the deal as well)?
http://www.nidirect.gov.uk/renewing-your-driving-licence-at-70-plus