Theres no way Shawcross was in any way responsible. It possibly deserved a booking for an ill timed tackle but in no way a red card. From what i've seen its hard to tell if he even caused the initial injury.
Ref lost his head.
Its unfortunate…but its a awful, awful injury and i hope that Ramsey can make a full recovery and that it doesnt affect Shawcross's career.
Wenger can just sod off. He's happily ruin someones career for no real reason.
and yes, its rather telling how none of Arsenal players came to help him…they'd rather shout at the ref than help a colleague.