Onsides n Offsides

In life, it's just like a football game, sometimes a perfectly onside pass is regarded as offside, thanks to the referee's blunder ( well, he is human anyway and humans make mistakes)...as expected, the side which have been denied that opportunity would cry foul.
Conversely, a blatantly offside pass can also be considered legitimate, resulting a goal to be scored, inviting controversy and a massive uproar of anger from the losing side ( the winning side will feign ignorance).
Whatever the outcome is, the decision is final. Remember Maradona's infamous 'Hand of God' goal in 1986 World Cup quarterfinal against England.Everybody but the referee saw how the goal was scored using his right fist. Despite the protests, the goal stood causing England to lose focus and lost the match and Argentina went on to win the World Cup. Should the goal have been disallowed, nobody would know how the outcome will be.
History shall remember the event as a gross error of judgement, but it will be still be something that invite conjectures of "what it might have been"but a fact is a fact,
In life, similar events happen, we might be forgiven if we said " Aiya..I should have done this and that, .I should have said this,Aiya..I should have taken this, and many other should haves.. In retrospect, we have many comments but what about dealing with the present moment. Warren Buffett once quoted "The rear mirror is always clearer than the windscreen" ..How truthful
Can we ponder the possibilities, ...just for a second, IF we were given a second chance, will our life be better than what it is now??
What if I don't want to know.