Rees Mogg of course suffers from the Catholic pro-life paradox. On the one hand, a life begins at conception and only God can give or take life. On the other hand, his chosen faith needlessly condemns millions to die from AIDS as a result on their failure to support the use of condoms. Presumably this is ok, because the Pope said so and his word is God's word but even so, they need to do a cost/benefit analysis here.
They weren't so fussy about life when they were crusading, or burning "witches", or throwing babies corpses in cess pits in Ireland etc. Pope Urban II wrote the Tony Blair rule book on "just war".