Lindsey signed up for the stop the apocolypse team. Signed up all the way, apparently had a talk with Angel made the deal. Sent him after the Sahrvin Clan and sent Lorne with him, only Lorne had a second mission, to kill him.
Couldn't have any loose cannons running around when it was all over and he decided Lindsey didn't deserve a chance like everyone else got.
So don't ever tell me he was a shining example of good.