I could go and say your pfp name fits you perfectly cuz holy doomposter and ended it there, but anyway that's just how human works bro, if your love one (and they're your child too) you'd do anything for them.
The father is so cornered for cash just for his daughter's medical bill, and now that someone show him that he can get enough money the "easier" way? yeah ofc he will grab it, he'd grab at anything at that point.
If say we take this to irl modern day, no matter what you say he also wouldn't think much about it until his child is cured and healthy again, then the guilt will kick in later and he will get depression, then we get to potential suicide.
Moving back the only reason he agree to side with MC at all was because he got that deal, MC shows him the way out, the guilt would still kick in of course, but at least with MC's house they can track back the children, as for the deceased child they can talk to the family involved and give supports, it sucks but it is what it is, things aint all black and white man.