Ah so you are in a situation which could be vulnerable - I would look at writing down with him all the poss scenarios he worries that could happen and list your plan for each one.
Even if you don't have a plan come up with one with him or make one up if it's not pg - ie my dd knows that if there's an earthquake at school and no one comes for her because the roads are out, that the school has a plan and someone will get her. She doesn't need to know her parents have a "in case you are killed in a collapsed building plan" for her collection. Of course if she ever asks, who picks me up if you are trapped we'll let her know we have a plan. Sadly we know of a few families that this was a reality for so its on our radar.
