Enter "Fray," your Shadow, the you who is tired of it and does complain about it at considerable length. Yes, the DRK Soulstone was the catalyst, but all it did was draw out what was already present. Now, your Shadow doesn't explicitly name the Scions as a source of frustration or resentment, but the Quest Log for DRK 45 explicitly states the Warrior of Light is willing to abandon the Scions, the Alliance, and even forsake Hydaelyn Herself to live a peaceful and quiet life, or pursue their own goals instead of just going along with whatever the Scions want them to.
Naturally, the entire point of the DRK 30-50 line is to force the Warrior of Light to accept his / her Shadow - the part(s) of him/herself s/he doesn't like and averts his/her eyes from. It's waaaay more complicated than just bitterness and resentment, but in the interest of trying to keep this somewhat on topic, I'll leave it there unless someone asks for a more detailed explanation.