Supposedly they are there to protect and support the Dragonborn, and then suddenly they demand that you murder the being that allowed the humans to banish Alduin, made sure the greybeards would not abuse their power and, finally, told the Dovakhiin how he could learn the 'Dragonrend' shout. What is more, the blades are not exactly 'clean' either - the missions they send the Dragonborn on are likely to result in many people's deaths. Yes, the Falmer and their servants tend to attack the PC but then again he IS trespassing.
I would like an update that allows you to persuade the blades that it is better to let Paarthurnax live. It should be possible to achieve this by modding the game, but the disadvantage of that would be that we would not have the original voice actors to give the appropriate replies.
