I see my answers were not understood or accepted. Perhaps the questions were not clearly enough stated, so the answers based on them were not what was expected, but never mind, let's move on. I am not going to go over it all again, and anyway, it has little to add to this thread.

Why does a necessary hormone for glucose control damage the tissues? Why, if sunlight is necessary for Vit D, does it cause skin damage? I don't think there is an answer to rhetorical questions like this, and what difference does it make? It is what it is, and the best thing is to minimise the exposure, and live with the damage that level causes.

As a case in point, if you suffer a stroke and blood leaks into the brain tissues, why does the immune system destroy great numbers of perfectly healthy brain cells as it cleans up the damaged ones? There are many defensive mechanisms in the body which do some damage as they perform necessary functions, sometimes they cause nearly as much bad as good, but it is what it is, a product of evolution. Perhaps further along the evolutionary timeline our bodies may correct this. I cannot say- it is pure conjecture, not my thing.

'Organisms' in a flu vaccine? The only vaccine today with a live virus is polio. Or do you consider any part of a virus as 'an organism'? How do you expect to go from the mercury in dental restoration to flu shots in one sentence and NOT be taken as pointing out the usual mercurial agent used to invoke an immune response???

I am sorry you feel pain on exercising, perhaps you should find a better trainer. I do not feel pain when I work out, only challenge and exertion. If it hurts, you are doing something wrong. As to why the 'old ones' worked so hard physically in searching for and capturing their prey, well if you don't, you starve. Ever watch kids in a playground? Why would they run around and exhaust themselves if it did not feel so good? I'm sorry, but I interpret your rejection of exercise as good and desirable, as pathological. I also question the direction this line is taking.