If you want to have the last word you can have the last word, no problem. However, I repeat - no one concedes 19 runs vs USA in a Super Over, that too with 3 ugly wides.
In spite of all that happened in that game including poor batting, fielding and bowling by others, it all boiled down to the Super Over and Amir held the fate of the match in his hands.
Considering his experience and reputation, he should have delivered for Pakistan in that moment. He didn’t just not deliver, he absolutely bottled it in humiliating fashion.
Amir fans wouldn’t keep quiet about his ability to deliver under pressure had he bowled Pakistan to victory in that over.
Similarly, they wouldn’t keep quieteither if someone else had conceded 19, and they would have been adamant that if Amir was there he would have won Pakistan the match.
It was embarrassing and he got badly exposed. End of story.