I totally fail to see how the following kicks are unnecessary. My process of thought if I were the keeper would be 'Attacked by opposition fan from behind, get him on the deck ASAP, ensure he don't get back up.'
I'm with the keeper all the way here and just cannot believe he was sent off, although this is actually quite common that players defending themselves against pitch invaders are sent off. Wasn't there a player who rugby tackled a guy to the ground so the stewards could get a hold of him and he was sent off also? Or was that a dream?