"Any power's a great power. I can see how yours would be especially useful," he pointed out, noting the self-deprecation and tried to be encouraging. That was a problem a lot of the youngsters coming into Xavier's school- coping with their powers and learning to be proud of them. It could be overwhelming at any age, especially with whatever Sally had to face before she came here. Kurt didn't know much at all about her history but if she ended up living like a criminal holed up in that warehouse begging for scraps then he couldn't imagine she'd had an especially happy childhood. Some mutants did, a lot of them didn't. Kurt's was for a long time, in spite of its having been rather bizarre, but he also knew what it was to struggle and be reviled simply for being different.