They might say this because the Bijani sisters went through surgery and died. They might say that many people would have to die if they chose to go through with this surgery because many pairs of conjoined twins share vital organs and blood vessels. However, even though the Bijani twins died, they were willing to risk death in order to form a sense of independence. The famous neurosurgeon Ben Carson said that "If we didn't keep trying when we met with failure, there would be no cars and no airplanes." This means that we have to keep trying in order to make advancements. There also has been successful surgeries. Ahmed and Mohamed Ibrahim, Carl and Clarence Aguirre, and Patrick and Benjamin Binder are three sets of conjoined twins that were separated successfully. Emily and Caitlyn Copeland were a set of twins that were connected to the liver and survived.
Conjoined twins should be separated. They should be separated because if they're conjoined and one dies, the other would too. If the twins are separated, they can gain social acceptance and not be seen as “monsters” or “freaks.” They can also gain independence from being separated, and it has been successfully done