yeh i know another vaccine thread

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but i have a problem, the moment had came and at work i was given an ultimatum, basically they say get the vaccine or fuck off.
now It's important for me to say that i do not believe in any conspiracy, but i have some concerns.
I'm not a medical person and i do not pretend to be,
but since im hearing only good things about the vaccine in the media, i want to hear some honest professional opinion.
so i have a few questions that i ask /sci/ to address
1. is there any correlations or potential for autoimmune diseases?
2. is there any correlations or potential for ADE?
3. why mRNA based vaccine and not traditional?
4. according to what experts claim, that because mRNA acid is decomposes after a short amount of time there is nothing to worry about long term effects, is that true? there are no implications to what i mention in questions 1,2 or other things that may popup?
5. is there any rational explanation that explain why we need to vaccinate 100% of the population including kids? i ask this because i have come from the premise that herd immunity has already failed

please avoid talking politics this is not what this thread is about, and please dont spam and shill about the vaccine seriously, i do not want the discussions to become a sub level insults war.
In fact i would prefer that only people with medical knowledge answer me, thanks...