Not the same at all, Loghain don't care about The Blight, he only focus on how to secure his power after the power vacuum caused by him. He's selfish. He's the cause of civil war remember?
As TEWR stated, Teagan is the cause of the civil war. Loghain wanted to the unite the nobles to defeat what he thought was a "darkspawn incursion."
The Warden job in The Landsmeet is to unite Ferelden in which being divided by Loghain, execute Loghain for what he's done. Why want to spare him? No reason to spare him
You're misrepresenting the Warden's job. First, a Warden is supposed to avoid politics altogether, but your hand is forced. There's no way to reasonably assume that your job is to execute a regent. There's no reason to even think that scenario would present itself until Loghain challenges you. Your job is to get the support of the nobles.
You already won against Loghain, you already prove he's wrong and expose all his crime, but suddenly you turn back from what you're doing?
Turn back from what, exactly? Loghain challenges me, I defeat him, and then he surrenders. Making him a Warden is no less of a death sentence than executing him.
It is like you already prove Hitler crimes, defeating Hitler in a duel, but then you make him one of you
I was wondering if a Hitler analogy would rear it's ugly head.
The reason Alistair leaving is because you turn back from your own cause in the Landsmeet
No, the reason Alistair leaves is because I turned away from his cause, big difference. My cause is to defeat the Archdemon. Alistair is more concerned about what happens to Loghain. Alistair cares less about the Wardens and the Blight, and you, for that matter, than he does about killing Loghain. Which says just about everything I need to know about Alistair. If I may, here's the Warden Oath, the one both you and Alistair took: "Join us brothers and sisters. Join us in the shadows where we stand vigilant. Join us as we carry out
the duty that cannot be forsworn. And should you perish, know that your sacrifice will not be forgotten. And that one day, we shall join you."