Honor culture kills without needing a killer
In a village where a family's izzat (honor) depends on its daughters' reputations, being seen with a boy can be socially fatal to a girl, whether the final act is murder or suicide. Constant surveillance by relatives and neighbors enforces the expectation that girls stay 'good,' which makes such deaths ordinary rather than aberrant. Establishing who tied the noose does not settle responsibility, because the pressure that produced the death was collective.
