They are. All spirits are terribly fragile. Mages have many theories as to how they come to be- if they are born of memory and emotion in places where the veil wears thin or if they are the purest forms of our souls after we die. Asking does not offer much of an answer as Spirits normally do not have need of memory. They are bound by perception and intent. How I perceive a particular spirit shapes it. They are a purer being for it but all the more susceptible to corruption- moreso than mortals.

[ Intent shapes so much of the fade- it warps the very fabric should it be strong enough. Shapes the spirits and taints them into something else. Something off. ]

Compassion is driven to help. To provide comfort where it is needed. That can twist into something else- a need to be needed. A need to be what is wanted rather than required. To become desire. I met such a demon in my Harrowing and it's song was as familiar to me as Compassion's but discordant. Wrong. Were I not so familiar I may not have seen it for what it was.