A fundamental point about anti-personnelle land mines which does not get made is that they are economic weapons: Their primary function is to destroy the rural economy of a country or region by making farming difficult or impossible - this makes them of enormous geo-political importance. They are small and very, very cheap and can be broadcast over huge areas from planes. A variation is the Israeli use of "dud" bomb-lets from cluster bombs to destroy the rural economy of the Lebanon when they last invaded; forty percent of the bomb-lets from the cluster munitions were "dud" - a quote from the BBC: an incompetent weapons designer indeed!
This is the reason we are served up with the bare faced lie that it is impossible to limit their lifespan, say to 6 months. There are a hundred ways to do this.
(Incidentally, the "They only blow peoples' feet off because that way you remove 3 people from the battlefield" - the victim and the stretcher bearers - is clever and characteristic propaganda. The real purpose is it makes them smaller and lighter and therefore easier to broadcast over large areas.)