God has blessed many with this technology. If done right, there's no problem. I'm sorry if that robs you of the opportunity to make a moral grandstand.
If there's no problem, as you assert, then why are we pushing 100 responses on this thread? Obviously not everyone agrees with you.
Remember that New York Times Magazine article by Amy Richards? She wound up with triplets after a wildly successful IVF procedure, and decided to "selectively reduce" two of them so she wouldn't have to move to Staten Island and give up her trendy Manhattan lifestyle, or have her remaining child "suffer" the knowledge that he had two unknown siblings living happy lives with other families.
Is there a "problem" there, in your view? Is it a "blessing" that she hired someone to reach into her womb and kill two of her unborn children, and wound up with a healthy son?
When people talk about the "slippery slope," this is exactly what they're referring to. The idea that tiny humans are disposable, expendable, starts in the petri dish and extends right into the womb.