Remember kids... always wear a helmet. (The almighty bikeradar helmet thread)

Is it not possible to do x y and z to prevent a collision, AND wear a helmet that will prevent some injuries in some accidents? i thought that it was.

It's possible once you realised that in order to ride with less risk, you have to alter the way you ride, rather than the sheer number of equipment you're wearing.

Your logic appears to be akin to 'why do rock climbers use ropes, surely they should just hold on to the cliff face tightly and not let go?'

No, my logic does not seemed to be akin to the rockclimbers using ropes, are you out of your warped mind?