The "too much social interaction" suicides you describe are really not about social interaction, but rather a lack of resources (mental, financial, etc) to adequately cope with various social demands. I don't see how it's really social interaction at all, in the colloquial sense.
In my examples the lack of resources in themselves are not an issue, it's the lack of these in the face of social pressure/involvement (kids, parents, coworkers, etc).
