It's less "what's wrong with abortion" and more "what's wrong with a culture that requires it be openly celebrated as a 'right'". The act of bearing a child to term and successfully delivering it is more "art" than "science" in many cases, and there are numerous cases where a mother, through no fault of their own, is faced with the choice of either aborting the unborn child or dying themselves. Cases where children are created due to rape or other abominable circumstances also occur, although this is more a matter of not having a support system in place where the mother and child can be protected from the consequences of acts made against both of them.
Every child is sacred, but that does not mean every child needs to be born. The issue is that while the unborn child is rightly perceived as a burden to be borne (and some burdens are heavier than others), promoting abortion as a means of removing the burden out of convenience - rather than out of absolute necessity for survival - is the issue that permeates modern society.