Originally Posted by
Ielenia
I agree with most of what you said, but I'd just change the part I put in bold. To me, everything Arthas did up until after Stratholme cam be tracked back to "trying to prevent more loss of life amongst his people."
You see, I believe that Stratholme broke Arthas. Having to kill so many innocent lives-- even if this was for the best for them to avoid damning them into undeath-- took a heavy toll in the prince's mind, especially since the culprit for this, Mal'ganis, has escaped justice, fleeing to Northrend. The way I see it, revenge became everything to Arthas because he needed to bring the responsible for plaguing Stratholme to justice, to 'close the case', so to speak, which is what led him to the desperate acts he committed in Northrend, such as preventing his troops from retreating back to Lordaeron after a direct order from the king, betrayed the mercenaries he hired to destroy his own ships, and took up Frostmourne.
All part of the Burning Legion-- I'm sorry, the Jailer's plan, of course.