He continuously pressed for aggression against his neighbors and is responsible for the murder of a royal. 
He continually pressed for the punishment of an expansionist, imperialistic, oppressive realm for their crimes against the rest of the continent.
And while
I may be responsible for the murder of a Royal, Delvin is not, save perhaps in a "the buck stops here" sort of way. He neither authorized nor condoned the execution of...Katya? I'm terribly sorry, but I've forgotten her name now, after about 4 years. (He did, however, privately rejoice in her death.)
