Ok so for a while he had you believing that he was a just mis-guided guy trying to erase a really bad mistake.
Then he turned into a horrific sociopathic villain.
"If it makes you feel any better... I was never going to spare your crew".
Ok so how did this guy become an Admiral?
The only even remotely possible reason he could have for destroying the Enterprise would be to stop word from getting out of what he had done, but would a Starfleet Admiral really behave this way?
The character just doesnt make any sense at all.