ok so I couldn't figure out what to do then i decided to list the reasons not to do it
1. Delphine's reasons made no sense to me at all.
2. Paarthanax had plenty of time to make up for what he did
3. He could have lied about the Dragonrend shout and say there was no way to learn it.
4. He could have bit my head off when I asked him about defeating Alduin but he didn't
5. He is all nice and calm about things
6. I only knew the blades for 3 days and all they did was send me on a possible suicide mission to the thalmor embassy
7. He is the leader of the greybeards
8. Hes like the grandpa I always wanted ^~^
theres actually no reason I can think of to kill Paarthanax
1. Delphine's reasons made no sense to me at all.
2. Paarthanax had plenty of time to make up for what he did
3. He could have lied about the Dragonrend shout and say there was no way to learn it.
4. He could have bit my head off when I asked him about defeating Alduin but he didn't
5. He is all nice and calm about things
6. I only knew the blades for 3 days and all they did was send me on a possible suicide mission to the thalmor embassy
7. He is the leader of the greybeards
8. Hes like the grandpa I always wanted ^~^
theres actually no reason I can think of to kill Paarthanax