Here is the answer I sent to Nasha
As I said, in an ideal world, Match Officials would be able to come out after a game and explain decisions.
There are however two major considerations which make this impractical.
Firstly the Media:
Shall we say, for example, Anthony Taylor has given a penalty for what he percieved to be a foul. In the post match interview he is asked about said penalty and replies that from his position on the edge of the "D" he saw John Terry trip Romelu Lukaku.
The guy interviewing him then shows a clip which proves that there was no contact. This is from a camera behind the goal and is therefore from a vantage point Anthony will never have but still it proves that the decision was in fact arguably wrong. This will then bring into doubt the credibility of decisions made in future games, not only by Anthony but by all officials and also may impugn the integrity of a player who has (arguably) been shown to have dived
Then - Our litigious society:
Continuing the above scenario, Everton score the Penalty and win the game. By so doing they qualify for the Champions League whilst Chelsea miss out on Europe entirely.
As the 'evidence' would suggest that the penalty award was incorrect and given the financial repercussions it is sadly not beyond the realms of possibilty that Chelsea, their owners or their supporters group(s) would instigate legal action to at least have the fixture replayed if not to attempt to extract compensation (damages) from either Anthony, the PL, the FA or all three.
Hope this very brief note helps to explain at least in part.
I could have expanded this and am happy to do so if you wish as there are other potentially relevant matters which might be taken into account
Please do not "shoot the messenger" on this nor interpret it as an excuse for officials to evade responsibility for their actions.
Believe me, if a Referee stuffs up big style there are repercussions