The same could be said for barbed hooks, particles, boilies, sacks then.
The only reasons people can give for banning it is via the use of hindsight and a few selective pictures published in magazines. It's no more dangerous, if set up correctly, than any other leader. Even mono straight through can tackle if a fish is left trailing it.
I'm guessing you'd advocate the use of them dreadful "Safe-zone" leaders marketed by Korda? You know, the ones with multiple tungsten sections for the bead to get caught on? Hardly ideal is it.
Secondly, what do you mean it offers no advantages at all? It does actually help the last 3-6ft of your line sit pretty (better than anything else, providing you prestretch it) flush to the bottom, although it does "tightrope" if angled on debris (the same as EVERYTHING else). It's durable, so the advantages are there if bars, mussels etc are present. I believe (I say believe as I don't know what it looks like through a carp's eyes) it is quite inconspicuous. It provides the best balance as to why leaders are used in the first place.
It just seems people are jumping on the bandwagon recently, regarding the dangers of leadcore, even though it has been used for years. Why are people only just starting to make a fuss about it now? Was it not a problem before?
Also, whilst I'm rambling. Why are tackle manufacturers still selling the same size leadclips even though they tell you, at every concievable opportunity, not to push the tail rubber all the way on, as it may cause the lead not to eject? Why not make the bloody clip smaller then to eliminate idiots doing so?