Getting sent to your country of origin because your parents brought you here as a child illegally (while a huge personal setback) is nowhere near in the same league as having your life snuffed out in the womb.
In the U.S., the legislative branch makes laws and the executive branch enforces them. I happen to think Congress should make provision for those brought here illegally as children to make a case as to why they should be granted citizenship, but I don't think he plight is the Dreamers compares to the plight of the unwanted unborn, unless the person is going to be sent to a country where they will face certain death.