Nem, embryonic stem cells are not harvested from aborted fetuses. The cells are harvested at the blastocyst stage, most women wouldn't even know they are pregnant at that stage. It is even before the implantation stage, less than seven days from fertilization.
If you have a beef, it is with the fertilization clinics, not stem cell research. Stem cell research puts to use cells that would otherwise be thrown away. You don't like that more eggs are fertilized than can be used. Fine, argue that point. That the cells are now used for needed medical research is a better option than throwing out the unused cells.