Re: "it seems a little imbalanced to me to bang them up"
"If the sun gets in to your eyes, what should you do? Immediately emergency stop? Maybe that will kill the person behind you who has also just driven in to glare? Back off the throttle and coast in to a space which just before the glare hit you saw to be empty? It's not an easy decision and it will depend on the exact situation."
You should "drive at a speed that will allow you to stop well within the distance you can see to be clear" (HC126). I've never known the sun be particularly unpredictable, that's not to say I've never been dazzled by it, but I generally know when it's coming. The sun doesn't dance around the sky, it doesn't jump out.
Also see HC93: "Slow down, and if necessary stop, if you are dazzled by bright sunlight."
You should be slowing down *into* that situation, and then slowing further. The vehicle behind you should be doing the same. You shouldn't be driving onto any piece of tarmac that you haven't actively confirmed is clear of other road users.
The difference is that these all resulted in death an no prosecution - because this is tolerated:
The vast majority of people simply ignore the requirement to be able to see where you are going - and it's that simple fact that contributes to many lives being taken each year.