"It's a pity that certain teams who lost did not have the grace to accept defeat."

When the defeat is the result of referees wrongly disallowing goals and so forth, and the evidence is there on film, it's expecting rather a lot for people no to register their disagreement and even suspicion of the officials, in some cases.

Of course, there was a time when it was considered unsportsmanlike even to attempt to save a penalty, when a referee awarded it. Maybe they should try to get back to that as well. But I can't see it happening myself.