Evolutionary advantage and disadvantage are far more complicated than that. For a start, suicidality is a part of the human condition. It hasn't been bred out of us. It has persisted in the global population. Presumably there is some positive consequence for the long-term success of a tribe, to balance the obvious impact that suicidality has on numbers. Perhaps there's something about the existence of depression, self-hatred, low self-esteem and so on which are bad for the individual and good for the tribe; perhaps they are allied to the capacity for shame and guilt and therefore mitigate the excesses of self-interest. Maybe it's something to do with the capacity for self-sacrifice in tough times. No idea. But there clearly is some associated evolutionary advantage which explains why humans have evolved with a tendency to suicidality.
We might not be happy with suggesting that this capacity for suicidality manifests to greater or lesser extents in racial groups. That depends on whether you want to believe in racial differences, and the very concept of race. The alternative, considering the Finno-Ugrics, is to link it to linguistic communities. How one does that, depends on your view of whether language is a shaper or a translator of reality, and whether it is innate or acquired.
Anyway, this is all a little off-topic on a discussion about our great national act of self-harm.
