I wonder, also, about when Catholics believe the soul comes into being. Does contraception deprive an existing soul a new incarnation? I doubt that physics supports that idea (see the book review "I Am a Strange Loop" June 1 on the books log for more.
Merton was concerned with the Marxist idea of "from each according to his ability... ", etc., as a spiritual idea. The "natural family" movement says that this idea belongs in the extended family as a eusocial motive.
Merton kept writing, when the Catholic Church and Vatican normally suppress any original thinking (and its publication) from lower or mid level clerics.
The DVD offers an extended "short" (another full hour) film by Father Matthew Kelty in several chapters, "Remembering Thomas Merton" (2003), by the Thomas Merton Foundation in Louisville, KY. here.