I hear eugenists say “there’s not enough people” in place of “we need more specially white folk so the uneducated colored don’t replace us” far far more often, see Elon musk and the like.
I’ve actually only ever heard “there’s too many people” come from anti capitalists.
I think he was just imminently concerned about their safety. Like the post suggests, many thought desperate times were coming and any rando in a maga hat might retaliate.