No "they" are forcing us to be part of a human experiment.
It doesn't matter that what I eat, or the fact that I drive a car, or other medication I take is several orders of magnitude more risky than getting vaccinated. I just don't want others to decide what's good for me.
When you eat, others have likely decided what's good for you - the meat is probably USDA inspected, the grain subject to requirements on maximum levels of rodent and insect bits, etc. When you drive, others have decided crumple zones, air bags, brake lights, and other such things are good for you.
It doesn't matter that what I eat, or the fact that I drive a car, or other medication I take is several orders of magnitude more risky than getting vaccinated. I just don't want others to decide what's good for me.