Nobody argues that a new instance of unique DNA isn't life. This is nobody's argument. People argue that it does not have personhood. I shed skin cells constantly that have my unique DNA, and they die, and that's not killing a person.
Oh man. Nobody is denouncing this because this type of person is a made up myth. People getting a 2nd abortion (let alone a 3rd or more which is very rare) are people who are usually older, have already had a kid, were using contraceptives, are low income, and minorities (or some combination of all of these factors). For most, it's a traumatic and awful experience that can wreak havoc on your spirit and your body (and most people believe that it lessens your fertility).
Where are you learning these mischaracterizations?
Please do the absolute bare minimum of actively trying to understand where reality lies here.
https://pmc.ncbi.nlm.nih.gov/articles/PMC5771530/