because they have to spend the taxpayers money in the case of the BBC, no idea why ITV people do it, because they would feel left out if they didn't.
as to asking stupid questions, the ones that get me are after a sportsman/woman has given their all, their guts are all over the floor, they are sobbing their heart out having lost that all too important game,
they have to face a commentator with a microphone who says, how do you feel, now you have lost,
what could anyone say...
most of what i would say after getting my breath back is unprintable.