WB WTP!
“Had this boy’s parents been tested and their mutation carrier status identified, they presumably would not have married and this boy would not have been born. But he has lived 20 something healthy, productive years, presumably bringing his family nachas, doing mitzvos, learning Torah. Should all of that not have happened?”
Excellent point that is not stressed often enough. The same principle applies to when a couple r”l divorces and some people unfortunately express regret over the fact that they ever married, not considering the beautiful Yiddishe children they brought into the world.