Even when things seemingly don't matter, most people are infuriatingly spineless. At my university (and it was a male-dominated field, not some gender studies liberal crap) we had an "ethics class". During one of those classes, we had a hypothetical scenario thought experiment: You work in a hospital which is developing a brand new very promising treatment with fantastic results for a dangerous health issue with women. Your sister has this affliction, and would really benefit from the program, but she's not on the list. You can add her to the list but only at the cost of removing some stranger from it. No one will ever know you did it, neither you nor your sister will ever be punished for it, do you do it?
Every single person in the class, and I do mean every single one went "oh no it would be unethical to save my sister, I'd rather have the complete stranger live!". I stood up, looked at a guy spewing this filth and told him point blank (translated) "Are you kidding me?!". He looked like a deer in headlights, they all did. Even in a 0 stakes made-up scenario, people spew the most vile lies (or horrifying truths?), they won't even accept the basic premise that your family should matter more to you than a complete stranger you will never meet.