When will they figure out that, in the case of a fairly small
plane, people would generally be much safer inside those
stone buildings?

oh crap. When will people learn that the risk from a fairly
small plane is so small that they should stop running around
like chicken little.

Exactly. However, there's always a minor risk of attack by small
airplane. Thinking otherwise is head-in-the-sand. But the reaction
needs to take the aircraft size into account.

"much safer inside" my foot.

Officials are still reacting to airplane incursions as if it were 9/11
airliners coming at them. (In that case, yes, evacuate major
buildings!) The point is, for smaller aircraft, there's no need to
cause disruptions, panic, headlines, and lessen safety by running
people into the streets.

The risk of crash or explosive deaths from a small plane is less
inside. In the potential case of CBR weapons, it's also safer being
inside.