I think selfishness is inherent in human nature, and in all of nature. I also question if there is anything wrong with that. there is a great symbiosis to it. a more worrisome act to me on a greater scale is the rejection of this. “for the greater good” is a loved phrase by dictators and tyrants for a reason
Discussion
We know acting selfishly is wrong because of its definition as an “excessive” concern with oneself. We see it everywhere in modern society with men abandoning children, women killing infants in their womb, etc. Taking care of oneself within reason is not selfishness. Prioritizing oneself at the expense of others is selfishness and is bad.
Agreed, Church teaching is that good ends do not justify bad means. It is staunchly opposed to utilitarianism, for example. Quoting the Catechism of the Catholic Church, 1755: “A morally good act requires the goodness of the object, of the end, and of the circumstances together.” 1756: “One may not do evil so that good may result from it”.
Christian teaching opposes tyranny. But it does it not through its own tyranny, instead through love. So much so that God Himself, who could do whatever He wants, chose to die on the cross so that we may learn to suffer for love as much as Him and in the end, come out triumphant.