Are immigrants crazier than the rest of us? Cho Seung-Hui was clearly not right in the head. Is this a common problem among immigrants? Mentally troubled people might escape the messes they've made at home by moving to another country. Or maybe stress from living in an alien culture might send some over the edge.
General Social Survey participants were asked if they have ever suffered from a mental illness. This is the share who said "yes":
Percent having had mental illness
Keep in mind that the immigrant sample is only 89 people, but these results indicate a comparatively healthy immigrant population. Immigrants, at least those from distant lands, have to be pretty high-functioning to navigate the challenges of a new life. If I find data on the children of immigrants, I'll post the results.