Wynne: And what of all the soldiers who died with their king? Their lives were worth nothing to you.
Loghain: You think so, do you? I knew their names, mage, and where they came from. I knew their families.
Loghain: I do not know how you mages determine the value of things, but they were my men. I know exactly how much I lost that day.
[/list]You don't think the man has experienced regret? Really?
No I do not think he regrets it. He knew the value of them and used them that way. He knew them, and used them. They meant something to him, they meant a battle would take place that he could leave and say there was no chance to rescue them. The question was "they meant nothing to you". The response is "they did mean something". They meant his plan succeeding. It's like any pieces you sacrifice in any strategy game. Those pieces do have meaning, they are worth the sacrifice.
But let's say I agree with you that he does regret losing the men. Does he regret his plan? No, he does not. So we can say he is a good person for regretting the loss of his men, but he does not regret sending them to the battle to lose. Which in turn leaves me to believe he didn't care about the men at all. If he was really going to regret killing hundreds of people, he would not have staged a pointless coup.
And yes it was pointless. You say letting in Orlesians so close after the occupation is stupid. How many troops you think the Orlesians are going to send? Probably an armies worth, yes. You think an average size army can take the country? Ferelden was conquered so easily in the past because they were disorganized, they were a backwater nation. They are not any longer. If anything, Loghain killing all those men in the army actually weakened Ferelden more to Invasion from the Orlesians.
But lets look at it from a different point. They never summoned the Orlesians, hell they probably didn't need them. Loghain made a faulty battle-plan because he wanted the army to lose. He wanted Cailan to die. If Loghain would have charged with his heavy infantry when the signal was lit, I think there is a VERY good chance Ferelden would have won, but he didn't. Because of Loghain, the army lost. Because of Loghain Ferelden's forces were made weaker. Because of Loghain a civil war started which calimed even more Ferelden lives. Because of Loghain the blight was able to get to Denerim and sack the city.
If I was Orlesian and I did plan on trying to retake Ferelden I would not do it when their morale was high after stopping a blight, with the country united, with the majority of their forces still intact. I would have done it after the PC and his companions stop the blight. Ferelden is now devastated, it's perfect. Orlais could literally walk right into the capital if they wanted. But as far as we can tell from the Epilogue which seems to account for a few years (at least) Orlais never comes. Wait wait wait, didn't Loghain do all this to stop Orlais from coming? ****, I don't think they would have anyway. Ergo, his coup was a waste.
It means he's still making rational decisions and not totally consumed by hatred for Orlais.
Wait wait wait. So you are saying a person cannot be crazy if they make some rational decisions? Have you ever taken psychology? Here is a real world example. My friend has a two year old daughter who is thriving. My friends mother (who lives out of state) is normally quite rational person. Yet, she calls the police to say that my friend has a meth lab and his girlfriend beats their daughter. None of those things are true, so why did she do that? Because she wants a daughter of her own, and is willing to see her son suffer so she can have a daughter to raise on her own. I'm not kidding with you at all. This really happened. Tell me she isn't crazy for that? Oh wait you wouldn't though, to you she would be perfectly sane because outside that one event in her life she has always made rational dicisions.
If we assume he did betray the king by quitting the field when it
wasn't necessary, and after going through the toolset I'm about to toss
that theory right out myself, then he did what he thought was necessary
for Ferelden to be free.
His reasoning is flawed as to the examples I posted above. Yes, killing the king, destroying a good amount of your forces, destroying more of your forces in a civil war, then having even more of the forces die because you neglected the real threat (the blight) is a great way to gurantee your country freedom from occupation!

. He may have thought he was right, but as you learn at the landsmeet and from generally everyone you meet, the majority think he is an idiot.
Loghain didn't even believe it was a true Blight, why would he let Cailen get away with that?
Yeah because thousands of darkspawn pouring out onto the surface that require a whole Ferelden army to fight not one, but many battles against them, is a common occurrence in Thedas.

. Loghain heard Orlais and that was immedietly all he could think of. The sheear amount of darkspawn present should have been enough for any rational man to think something not normal was occuring.
They ended up doing the battle anway, without the Orlesians there, without the Orlesians anywhere in the country. So why betray Cailan, you could have easily defeated the darkspawn then had words with him in private about trusting Orlais so much. To Cailan the situation seemed dire, Cailan was thinking they might need more troops just in case. So after the battle, and after you have won, Orlesian troops would no longer be needed. So why kill a good amount of the Ferelden fighting force which would then make it even easier for Orlais to invade?