The rule is still there to protect the offensive player who was defenseless. I can't find a replay anywhere, but from what I can recall, Young did make contact with his shoulder first, but he also lowered his head which is what the rule is trying to stop.
I 100% agree that in the full speed of a game this is easier said than done, and that there was zero intent by Young, but I think the rule was correctly interpreted. That being said, I was surprised the targeting a few plays before was waived off, which just proves the subjectivity of this rule is a mess and needs to be fixed, especially with a rule that has the consequences of this one.