Say, for example, you were at an intersection preparing to turn left. Imagine that you had your indicator on, proceeded to turn left (picture in your minds-eye also that the light was green) and as you were, oh I dunno, lets just say 1/4 through the turn, you hear a sort of dull "clunk".
Envisage, if you will, that you then look in your rear view mirror and see a motorbike lying on the road next to the driver and passenger. Suspend reality for one minute and imagine that what had happened was that the motorbike had obviously tried to round you on the left (the wrong side obviously in our hypothetical example) to go straight (despite the big blinking light) and had then hit your rear-quarter panel when you turned in front of them.
So picture all of that. The hypothetical is would you then feel bad about thinking 'Ah fock it' and simply driving off? For arguments sake, you know, just imagining like.