The embryo is a lot less developed at the 9-15 day window, there's not a chance to really feel pain or panic and from a human perspective they're a lot less cut

The embryo is a lot less developed at the 9-15 day window, there's not a chance to really feel pain or panic and from a human perspective they're a lot less cute so their death is less affecting. The change from barely differentiate lump to chick happens rapidly in the last few days: https://www.nature.com/articles/s41598-024-72004-y/figures/2 https://www.nature.com/articles/s41598-024-72004-y/figures/2