Bullet Penetration not working

So I have tried to add bullet penetration. Take a look:

private bool isPenetrating;

void OnEnable()
     isPenetrating = (Random.value > 0.5f);

void OnTriggerEnter(Collider col)
      if (isPenetrating)
          isPenetrating = false;

void Disable()

The bullet is a trigger. If the bullet collides with something and it is supposed to penetrate, then it will not disable the object and it will turn off the ability to penetrate. When it hits another object, then it will disable. When it is reenabled, then it will have a 50% chance to be able to penetrate.

It does not work! It wont pass through the object at all.

Games compute very fast objects like bullets using raycasting. There are exceptions, but the physics simulation of a game only runs N times per second. If a bullet travels D distance in N seconds, and D is greater than the width of your enemy, your wall, etc, no collision is detected.