Gene edited embryos are ethical as it eleminates any potential genetic flaws such as down syndrome and handicaps, posting to reduce the suffering from the parents and the child among birth

Your claim is mostly irrational and based on emotions, your opinion is based on the originality of a baby's birth in most religions and to respect the work of God. While it provides comfort to a child's disability. Put your feet in the shoes of the baby, would you be happy if you're born without an arm or a leg? Or even worse, a brain disability that might put you in a state where you aren't even conscious of your condition。

Yes mistakes are often in life, and with individuals constantly opposing like you are, this particular research can barely hold a progress, due to constant protesting of genetic originality and so called "gut feelings". Us humans strive from failure and that's how we improve to change the society. The general term for this is "Trial and Error".