The history of ideas is littered with the corpses of those who have tried to define culture.
Writers such as Richard Powers and the late David Foster Wallace have shown the path to a newer generation of writers for whom all national boundaries are quaint curiosities.
Writing about Africa by Africans has been part of my literary apprenticeship, standing alongside works by authors such as Joseph Conrad, Joyce Cary and Graham Greene as influences.
You can gesture at the transnational problem of Islamist terrorism all you like, but it's just hot air unless you invest in proper security on the ground in your own country, with the right safeguards to civil liberties.