And.... there is an additional problem.
Have you heard of Bystandard Paralysis? You see, the public, the average citizen, are not trained or conditioned to react to danger or in this case, a sudden kidnapping.
When they see a kidnapping with a victim screaming they don't know what to do. They are frozen on the spot and unsure what to do. Some might think its a prank, and others fearful of lawsuits are unwilling. Still others, not trained in combat, instantly reach a moment of Fight or Flight (and Freeze or Faint) default to freeze. It's not their fault, it is a physiological defense mechanism that gives them the best chance of survival.
More on the Prank, there is another that must be accounted for, and that is Cognitive Dissonance with regard to danger, When an Active Shooting occurs it is all too common for people to think "Hey did I just hear firecrackers"?
Their mind, not used to or accustomed to the said danger, reverts to denial. They do not want their bubble notion of a safe world to burst. Afterward, they're left in disbelief; how could this happen? They're not trained to react, or accept that there is evil in this world.
So in this case, seeing someone being kidnapped before their eyes they revert to denial. "Is this a prank?" "Is this really happening/?"