Three parent embryos

Three parent embryos was approved in the UK yesterday. This article explains what this is about:

But what has been proposed, and now approved by the House of Commons, is not a treatment at all.  The proposed technique ignores people who already have mitochondrial disease, spurning them in favor of creating new individuals who will (advocates hope) not carry the genetic mutations.  The proposal is to manufacture genetically-engineered babies.  Mitochondria are inherited from the mother, so the proposal calls for recombining parts from two different eggs to engineer a genetically new egg (or destroying and recombining parts from two different embryos, to assemble a genetically new embryo), theoretically with healthy mitochondrial DNA.

My cab driver this morning understood this sounds like a terrible idea. The question is, why didn’t the majority in the UK Parliament?

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