Actually all these are added up AND are caused by one factor:
Ericsson chose to go with 2 unfit strikers, 1 not world class
striker and a 16 yr old who looks more as a mascot. When Owen got
injured, Erricson chose to go wif one up front, which btw Rooney is
not suited for, and dis added to fustrations, made him struggle and
ended stamping on Cavarlho's nuts (on purpose or not), den Ronaldo
simply juz went to da ref and did some remarks and dat summed up
Rooney's behaviour: He snapped.
So who to blame? No one really. Its all cause and effect: You drink
you pee. Dat simple.