For me, the problem is with the word used itself: 'troll'. There are no 'troll' results in this game, but there are fixed results in this game for whatever reasons or matches where the game take the side of one team so much that the other team cannot win despite having quality and tactics, and whatever happens in those matches have not much sense. This can occur against whatever opponent - weaker, same quality or stronger, active or non-active. There are also unexpected or abnormal results due to flaws in this game.
According to what some people refer as 'troll', it is where a weak, abandoned team (no manager, no training and so on) got a win or a draw against a much stronger team, but that is a fixed result too (in case it has nothing to do with tactics). This 'troll' word has nothing to do with it, and the topic of the thread itself needs correction.
For me, what is happening in this game is probably due to attempts to simulate how things happen in real life, just that in real life there is no abandoned team with no manager and no training. Other things have happened due to flaws too. For the first case. as long as this apply the same to every team in the same league, it is fair in some way to say, but sure it is a problem when it comes to knock-out stages.