It's effective to ask them what to do NOW because they don't know. All they can do is criticize what has already happened, they don't have idea one of their own. Liberals can only say what you SHOULDN'T do and what you SHOULD NOT HAVE done. They don't dare suggest what you SHOULD do because then they might be WRONG. Absolutely right!
We have heard a lot lately from the "root-causes" crowd, who keep telling us we must try to understand the grievances that motivate the terrorist, and we must make allowances. Yet they never seem to get around to telling us what those grievances are, why we are responsible, or how we could have made things better.
They are Monday morning quarterbacks with no new ideas.