I would expect any young person applying to Oxford and Cambridge to have the capacity to make an objective, rational, dispassionate assessment of the universities
Come now duchesse - stop pretending you've never met a "young person". (You may even have been one yourself?)
Objective. Rational. Dispassionate. Their brains aren't capable of holding those qualities. It would be entirely unfair not to recognise that schoolchildren will make decisions based almost entirely on how something feels.
Though of course that feeling will be influenced by the impressions they've gained from teachers, parents (and parents' friends) and anyone else they respect.
(I'm not sure I believe that any teenagers are watching Morse.
)