I see alot of, what ARE shoulder charges happening that are probably pretty hard for a player to make a split second decision and change what he has been doing for 5+ years instinctively. Times when you don't necessarily have time to pull out of a collision, but you also don't have time to make and actual tackle, so you brace and hit em with your shoulder/chest/body - and that is now deemed illegal.
Not saying Fui's was one of those, but there are times you go, well yeah it would probably have been hard to not hit him with your shoulder.
Seems a bit rough that Fui gets the same penalty as Fa'oso who totally blind sided a guy with a very forceful and intentional shoulder/body hit