Here are some resources for you to answer or help answer these questions.
Regarding vaccines and how they were researched and developed:
These lists are from the reliable pro-life Charlotte Lozier Institute.
How to think about moral complicity (from an LCMS scholar)
What You Should Know about the Covid Vaccines (Dr. Grobien, LCMS Seminary Professor)
(This last is from the Eternal Perspectives blog and is a very comprehensive article. Some of the information I have already linked to here, but there are some others links and videos as well. I have not watched them all so cannot vouch for them all, but lots of information here and this seems to me like a very sober and accurate assessment.)
The matter of moral complicity is a thorny and difficult issue to answer, and there are many things to take into consideration. So read and think about these things!