Well this is why I wouldn't eject him. It all happened way to fast for this to be some thought out thing by Clowney. Clowney started the play with a lower position than the RB so of course he can't help that his helmet happened to collide with the man's chin.
Exactly. He starts the play leaning forward and getting his pad level low. And then he is unblocked so he stays low... and then he just form tackles a short Vincent Smith. I just don't realistically see what he could've done differently.
In general, I think the "targeting" rule... or at minimum the ejection part of it... should be limited to defenseless players like pass catchers, punt returners, blind side kills-hot blocks, etc. What you're going to see happen is a bunch of game changing calls (15 yard penalty + ejection) for borderline bang-bang plays that lead to tons of controversy and outrage. It's going to be a disaster.
Here are ACTUAL examples of targeting, IMO:
<iframe width="420" height="315" src="//www.youtube.com/embed/Ac-JYp25Bx0" frameborder="0" allowfullscreen></iframe>
<iframe width="420" height="315" src="//www.youtube.com/embed/q1yurG8JvgA" frameborder="0" allowfullscreen></iframe>