Why Christians are fleeing Bethlehem

Christmas has become an occasion to bash Israel because Christians are fleeing Bethlehem. Leaving aside the fact that Israel is the only country in the Middle East in which the Christian population has grown over the last 50 years, it's simply not Israel's fault that Christians are leaving Bethlehem or any other city (Ramallah used to have a large Christian population) in Judea and Samaria.