Politics and religion.

[Edwina's Secretary]

These days, whenever there is a motorcade, buildings along the route are checked. Empty offices are sealed shut. Presidential cars are bullet proof.

Today, Oswald would not have been able to reach that window. Kennedy would not have been in an open car.

Sad but true. With all these nutcases we have today who have to make up for all their feelings of inadequacy with guns.... so very sad.