Is it? What are you going to do? Burn the machine learning books? Good luck

You may cite me on this - 1. first of all to ban the idea you will have to be specific enough in describing the idea in a law that can be referenced so that when people think they are encountering the idea they may reference the law to be sure. Any one who can reference that law will be exposed to the idea.

2. ideas are not static expressions, perhaps we can think of them as nodes in a directed graph of all human thought, if you want delete the node you should direct all the nodes with arrows pointing at that node or someone is going to notice hey there are a lot of arrows pointing over here at this node that is gone and come up with the idea all over again by what is implied by the arrows.

3. if we think of ideas instead of how memetics would describe them we have a similar problem to number 2, that idea evolved from other ideas, and it is evolving into other ideas as we speak. Perhaps at some point we will have the technology to get rid of a memetic infection but not yet. And considering how well we've done on getting rid of measels I doubt it.

4. Probably the closest we can come to killing off an idea is the destructions of heresies in the middle ages, for example the Adamite heresy https://en.wikipedia.org/wiki/Adamites however the ideas still exist as evidenced by the Wikipedia page, just nobody cares enough to embody the idea.

So, instead of killing facial recogniton if a similar thing were done with facial recognition that was done with the ideas of the Adamites we should kill a lot of facial recognition researchers and people building facial recognition tools, and then hope that nobody new will care to do any facial recognition stuff (if you get brutal enough that just might be).

Making the idea unpopular might work, but I doubt it, because the utility and power the idea promises would be too great a temptation. Do you need a citation on the too great a temptation statement?