Regarding the vaccine, no science shows that the vaccine is dangerous, though there are maybe complications to people with weakened body, just like any other vaccines may have. There are many different factors that have been not yet studied regarding the vaccine, due to the lack of research time to conduct the studies. Nonetheless, the vaccine had been proven to be effective, yet results may vary.
You should keep in mind that there is no perfect things that can be invented in this world. There are many factors that can affect the effectiveness of medicines/vaccine when it comes to pharmaceutical. That's why they used the term EFFICACY instead of Effectiveness when stating the percentage.
Actually, Covid only weakens an already weak immune system. If the immune system wasn't weak in the first place, Covid wouldn't have any affect. All the vaccines do are to weaken the immune system some more, but in ways that might make the body less attractive to Covid a little. However, the further weakening from the vaccines make the whole body unable to resist all kinds of other things.
The main point of these novel vaccines is to reprogram people so that they have a difficult time resisting 5G electromagnetics acting to reprogram them further.