Why? FFS it’s not too hard to work out really, match officials have to meet in a pre-arranged location a few miles from the ground and are then driven to and from the match because it had become unsafe for them to arrive at stadiums in their own cars.
Can you imagine the uproar if a referee admitted making a mistake in a game that had an effect on the result, to then give the team he aggrieved preferential treatment in the next time he officiates? They get enough abuse as it is, why make it harder for them.
Then we have the fans, it’s not exactly uncommon for referees to receive death threats or other acts of violence just for giving a decision against their team, imagine the uproar if he came out in the media and backed his decision or admitted it was a mistake, there would be calls for a replay, for him to be sacked ond yes, even more death threats. Look how Chelsea reacted after getting knocked out of the UCL v Barcelona a few years ago, do you think they would have said ‘ah fair enough’ had the ref came out and spoke to the media?
Referees can give interviews after a game if they so wish, however it is discouraged by the FA and I’ve yet to see a referee go against the FA wishes.