I was wondering, when Wolverine cut off Deadpool's head, do you think that, had Bob, Agent of HYDRA, not been there, Logan would have put Wade's head back on his neck where it belongs?
I mean, on the one hand, Wolverine did know exactly how long Wade's head could be separated from the rest of his body before lethal brain damage would be achieved (or he knew how to act like he knew how long that takes). And he admitted that he really only wanted to keep Deadpool out of commission for a few minutes, until he could kill the Penatraitor (what a name, criminey). That sort of indicates that he didn't really want Deadpool to die, at least no more than all the other people who don't hate Wade and only sort of want him to die (so he'll shut up, you see).
On the other hand, this is Wolverine we're talking about. The guy doesn't exactly have the highest regard for human life, and can be a bit vindictive. And Wade has screwed Wolverine over a few times (I recall a Wolverine story drawn by Liefeld where Wade captured him so a weirdo could get ahold of Logan's blood to run experiments on it. At least that story gave Siryn the use of her vocal cords again, so not all bad), so Logan might just be inclined to figure Wade's done enough crap that he deserves death. He's kind of a jerk like that sometimes.
I'm pretty sure that even if Wolverine had put Wade's head back, he would have put it on backwards (like Bob did) and left it that way. Just because. Then he'd go smoke a cigarette off-panel, because Quesada can't control what Wolverine does when he's not actually in the picture.