We do not need our bodies once we leave this world regardless of what you think happens after we die. We should be focused on curing diseases and extending the life of living humans. Science would go so far if we used human bodies after death instead of requiring people to give consent to something they don’t need.
https://www.kidney-international.org/article/S0085-2538(19)30185-1/fulltext
The cited article shows that there is no difference in the death rate of donors between opt-in an opt-out countries.
But it does not support the claim that most countries are opt-out. They only look at OECD countries, where opt-in is in the majority (18 opt-in vs 17 opt-out).
Hm. Interesting, actually. Thanks for the info. It is quite unexpected data for me.
Table with countries:
https://bmcmedicine.biomedcentral.com/articles/10.1186/s12916-014-0131-4/tables/1