Was the tackle by Cahill deserving of a red card? Not whether it was a dumb decision by Cahill or such, but simply was a red-card deserving challenge? It didn't seem so to me, in light of what is accepted in the game, but am I just calibrated wrong?
It's being discussed in the WC Refereeing forum: https://www.bigsoccer.com/forum/showthread.php?t=1458744