That's a very good point but it's hard because all you want to do is shield your children from harmNowt wrong with being aware of your environment mate.
But cities are bloody massive. The chances of being involved are infinitessamly small. It's the press that amplify the risk.
Barcelona population, over a million. 13 died today.
Just don't let your concerns leak out in front of your kids. That's your issue, not theirs.