Lots of spoilers by the way for people who have not finished certain aspects of the game so click at your peril. Title could have been more tactfully written.
No I think the Blades were short sighted cunts with nothing but an old spiteful vendetta for wanting to kill Paarthurnax. It isn't like he trains and makes powerful the one who can ultimately destroy him, betrays his evil brother on multiple occasions and then decides to spread his particular peaceful philosophy to all remaining dragons. Also he kinda keeps the Greybeards working by teaching them.