Emu it was actually either no arms, or tackling the player without the ball for Cooper's last one so definitely a different situation.
BH, I think that some people are just more capable of forming a balanced view on Hooper's cards. As you said it's not good but at the same time, Hooper made an error, and a lot of it because he was working hard to cover up for a mistake from somebody else.
The response to Hooper's card is perfectly reasonable. A bit of "Geez he's got a few now, better be careful about that". Mostly because like on Saturday, whilst he is certainly 100% at fault for the execution, he was put in the position of executing under pressure due to an error by somebody else.
You'd have to admit that the reaction is a stark contrast to vitriol Cooper received from Auckland last year, when that probably was a similar situation. Both were covering after misses/misreads by others, Cooper had to go high to prevent a try and Hooper was going high as part of a whole team strategy to prevent offloads.