Human Genetics Alert warns about the dangers of using human fetuses as tissue donors.

"The main objection... is that it objectifies the child by turning it into a mere tool, and so contradicts the basic ethical principle that we should never use human beings merely as a means to an end (however good that end may be), because they should be treated as ends in themselves. That is the basic ethical objection to slavery, for example. In response to this, it is often said that the new child will be loved for himself, and will not be treated by his parents as a mere tool, and this is no doubt true."