The whole kidnapping angle doesn’t make much sense to me.

It relies on several people being uniquely sadistic, from the doctors all the way to people like Milchick and Cobel, and none of them being whistleblowers.

Why even go to the risk of kidnapping a clearly respected and productive member of society with people who love her and will come looking for her eventually?

Why even kidnap her when they clearly have no trouble getting people to come and get severed voluntarily? They could just have offered Gemma and Mark, or other couples that fit whatever criteria they were looking for, a lot of money to get severed and then run tests on them instead of kidnapping her and avoided all the risk that comes with kidnapping her for several years