It has nothing to do with rooting against him or any kind of ill will. It has everything to do with the ability to view roster moves with hindsight.
In the end they gave up a second round pick for an 8 game rental as they redid his contract so he can be a FA after this year. For the player it really is going to cost him huge as he may be reduced to some kind of "prove it" deal coming off the serious injury at his age. For the team, unless they get him re-signed, they payed a premium price for limited results. So in hindsight, it really ended up being a net negative for them.