The US government has historically conducted quite a bit of experimentation on broad swaths of the population [1], not just your favored marginalized groups. So it sounds like "Karen" is perfectly justified in her skepticism.
Young children are at greater risk from influenza. Why do you think they have been barely affected by COVID this whole time, but somehow in the future, they will suddenly be the ones dying?
Of course you made a decision, unless you are an automaton? (ignoring the question of free will here). If the vaccine killed 90% of those who took it, you would of course take it, because "vaccines are just something you do"? No, you evaluated the risk.
And yes, driving a car absolutely is a risk, as is just about everything.
Viral vector vaccines are not the same as traditional inactivated virus vaccines, and are in fact similar to mRNA vaccines in some important ways:
1. mRNA vaccines and viral vector vaccines deliver genetic instructions so your own cells produce the targeted proteins
2. Like mRNA vaccines, there has never been widespread use of a viral vector vaccine prior to this year.
How did almost every human in all sorts of varying societies fail to understand something quite straightforward for almost the entire duration of human existence?