Should he be allowed to fly? He seems a menace.
Why does he seem a menace, b? As I understand it he landed on a parallel taxiway (which is almost certainly a parallel runway at other times.) It happens quite regularly, actually. On short finals one is often faced with two parallel strips of tarmac and, occasionally, one chooses the wrong one. Much blushing and apologising to the tower ensues and one gets on with one's day.
I once missed the airfield completely and landed in a farmer's field next door. Now that was embarrassing.