I'd actually have preferred better closure to the Loghain story than what we get. Having him locked up in the tower instead of executed in front of his child. Would have made a cool scene I think, coming into Ft Drakon to find him and a handful of guards fighting off darkspawn. He covers the warden's flank as you finish the mission to the roof and his fate is left 'unknown' like unQueen Anora's. Would leave him open for a return.
The reason we can't just have him locked in the tower to be executed or tried later is because we have to either kill him or recruit him to end the civil war. No matter how thoroughly we win the Landsmeet, at least a small amount of nobles support Loghain, which would allow for political unrest later should other nobles try to rebel or seize power in his name. The game makes it clear that the only way to stop the Blight and ensure political stability to recover afterwards is if the Landsmeet is united, and the only way to ensure they're united is to take Loghain out of the picture politically and give them a monarch they can all rally behind. If Loghain is not explicitly on your side (as in, takes the Joining and becomes your subordinate), then he's a political loose end that needs to be tied up with the hangman's noose. Execution or recruitment--there's no other way unless you want to invite dissension later.
Yes I'd have preferred that too. After reading The Stolen Throne Loghain became one of my favourite characters, and I enjoyed saving him and taking him around on quests to hear his dialogue. He should never have been killable, leaving him alive would keep the potential of his character open for future games. He's so well written with a great past and is a link to the old Ferelden of Maric, Rowan and the Orlesian occupation. That's an important history that most players will never know, leaving him alive would have let the writers explore that more.
I've only gone thru Inquisition once so far, but it was with Loghain. I loved seeing how he'd made a life for himself within the Wardens. If he'd been guaranteed to survive DAO, then we could have had either him or Alistair and just got rid of Stroud altogether.
Speak for yourself. I personally think he should never have been sparable since I think that's more than he deserves, but I'm not going to go around trying to force people to kill him just because that's what I do in all my playthroughts. Just because you've completely forgiven him and think he deserves redemption doesn't mean everyone else has.
(Yes, I've read The Stolen Throne. No, it doesn't make me any more charitable toward him. In fact, it made me hate him even more. In the game, everyone talks about how he was an honorable man who only recently started acting like a chronic backstabber out of pride and paranoia. The book reveals that, no, he was always dishonest and spiteful, and Flemeth herself warned Maric that "he will betray you, each time worse than the last." Not to mention his passion for freeing Ferelden doesn't give him brownie points for me anymore because it just makes his willingness to sell elves into slavery to fund his own armies, and callous disregard to a city elf who objects to it, all the more hypocritical and infuriating. Apparently "slavery" (more like military occupation) is only an unforgivable travesty when it happens to human freeholders like him, but it's completely fine when it's elves. He even tells an elven Warden who spares him and tell him so at camp, "Honestly, elf, do you think that among that among all my crimes is the one that keeps me up at night? It's a bit egotistical of you, don't you think?" Says the man that almost allowed the darkspawn to take all of Ferelden for fear of Orlais. **** you, you hypocrite. If you don't care about your own subjects that you sold into slavery, then I don't care about you or your tragic past. Go rot.)