Whether these lines were sometimes manufactured (i.e placing people into certain positions) or not it's clear to see that Henri Cartier-Bresson was well versed using leading lines as a compositional method. Something he found in nature, architecture and people.
I can definitely see the way that leading lines throw the viewers eyes around an image creating movement even when movement isn't the focus. It seems to add depth and gives a sense of a large and more complicated space.
France, Marseille, 1932
France, Paris, The Palais Royal Gardens, 1959
France, Marseille, The Allee du Prado 1932