There's a huge difference on both.
Su'a grabs the helmet, feels it and release, allowing Rodgers to go his reads, and make the throw for a TD. Su'a while making the penalty, did care about player security.
The Bengals guy, grabs Crowder by the helmet, and keeps the grab until he's dragged down while jumping over him, fully knowing he'll turn his head badly (and might break his nose), but doesn't care much about player security here.