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Maybe one day this will change (i hope), and as i said we must stay positive

Personally, I know quite a lot about our immune system.
Science and Scientists know even more than I do, and that is quite a lot. Our immune system has been studied very well, and it is easy to understand it.
(And vaccines are one of the most thoroughly studied medications that are on the market, and they propose no danger at all.)

I disagree, science knows very little about how our immune system develops. They are just finding out our immune system is made through interactions with our environment. That gut bacteria are a large part of our immune system and play a huge role in our psychological health. Science also just discovered epigenetics a second code of DNA that codes everything we interact with in our environment and passes this data on to the next generation.

http://onlinelibrary.wiley.com/doi/10.1111/gbb.12109/full

Epigenetics Is Everywhere. What you eat, where you live, who you interact with, when you sleep, how you exercise, even aging – all of these can eventually cause chemical modifications around the genes that will turn those genes on or off over time. Additionally, in certain diseases such as cancer or Alzheimer’s, various genes will be switched into the opposite state, away from the normal/healthy state.

https://www.whatisepigenetics.com/what-is-epigenetics/