Actually I disagree with you.

To have a grasp of the level of grief (or whatever emotion) you really do need to have had a similar loss. They can comfort but unless they've felt similar, they can't really empathise.

Such as death of a loved one, if you've not lost somebody to intrinsic to you as a person, then you really have no grasp.

For example, I can empathise with Rouge over LuLu's death, no I've not lost my best friend/sister, but have lost a parent, while I'm not 100% on the same wave length as her level of grief, I can understand it a hell of a lot more than if I'd lost a distant relative that I had minimal to do with.