How do mundanes survive magic?, OMG Stunball! Options

[KnightIII]

This has likely been hashed over somewhere else, but my searches have brought up alot of things that dont really relate to my question.

The average person has around 3 Willpower. Give or take a point. The average caster has around 4 spellcasting and 4 magic (not even playing min max). So if my understanding of the rules is correct, a mage rolls 8 dice against a measly 3 willpower. And when the target(s) usually fail to avoid it they automatically take the full Force of the spell plus net hits. With no way to migitate the damage. One or two of those will stun someone to sleep or kill em outright in the case of manabolt (ball). But manabolts arnt even nessesary if you stun and preform a coup de grace.

So, short over over populating the world with counter spelling mages, how do mundane folk (like Runners or security personel) survive that?