The basis of most morally sound ethics say that “the ends do not justify the use of any means”.
Sometimes science has to be told it has to, morally, take a different route to discovery of scientific questions, for moral and ethical reasons.
We are civilized societies BECAUSE we do not believe the ends justify the means (G-d tells us they don’t), that moral reasons alter the means that are accepted as justified.
Morals and Science do not travel the same road
Things that are wrong don’t become right because they might yield useful information. A moment looking at Hitler’s Mengele demonstrates this truth.
There is no excuse for dissecting living embryos for material to experiment with and there is no excuse for ignoring scientific ethics in this case either.
Hypothetical or even real ends never justify flawed means. The concept is a rallying cry for the Left which confirms that Leftists are evil.