Originally Posted by cherokeesam
Thor has already forgiven Loki. In Avengers, he's practically begging Lil' Brudder to just come home and everything will be all right. And even though Odin will likely be righteously pissed that Loki tried to murder him and all (or at least get Laufey to murder him), he might have just enough guilt within him to try and give Loki a second chance.
Thor didn't so much forgive Loki as try to persuade him to call off the invasion in return for going back Asgard. It was much more like someone trying to talk a madman out of going forward with his crazed plans than an offer of absolution. When Loki's answer to Thor's plea was a shiv in the side, the Thunder god had clearly had enough (finally!) and would have kicked his brother's ass if the coward hadn't cut and run.