Ya know, every story I saw on this before and after, mentioned that the expected chances were 50/50 at best. Seems to me they decided that the chance to develop as two individual persons warranted taking the 1 in 2 chance.
There comes a time when the person must make a decision and run with it. Not the government, not some other well-meaning institution. The desire and drive to be beholding to no man/person/government was rather a strong sentiment at one time in the UK and the States. Seems to me that more folk could use a lesson in that these days.
These young women made their decision, insisted against the "experts", and agreed that the chance of living as individuals outweighed the price of death. I hope they find their peace.