CAROLINE PAILLIEZ WHEN a suspected Islamist from Tunisia killed three people this week in a church in the French Riviera city of Nice, for many residents it brought painful memories flooding back. Four years ago, another suspected Islamist originally from Tunisia had driven a 19-tonne truck into a crowd about not far from the church, killing more than 80 people. The church attack, coming on top of the truck assault, left many people in Nice on Friday feeling they had angry, and wanting to fight back against the people they believe are to blame. "We've had enough," Nice resident Francois…