Because among certain Asian tribes / rural and urban communities, social laws are set in stone and when inter-communal couples fall in love or decide to marry, the community elders can go to the extent of performing honor killing.
Unless that Turkish man knew Krav Maga or some other serious martial art, how would he fight back four people ??
I don't mean to hurt sentiments but it's a very racist comment on his side; I remember a video showing some UK tourist who fought with 4 Turkish shopkeepers over some dispute in the shop, he knew boxing so he survived.