A simple thought about Nature and the Will of God

A simple phenomenon was buzzing in my head awhile ago while I was waiting for my best friend, Yna, to get down from her condo unit to talk to her:

I was looking at cockroaches a while ago in the facade of the condominium (there were 4 of them, at most), and recalled this lesson in my Theo 151 class about the fulfillment of the 'greater scheme of things.' According to Merton, it is said that a creature is fulfilling God's will for it when it does what it is meant to do. The tree fulfills its duty to God by being a tree--and it's the best it can do to become saintly. So, in that premise, we can say that the cockroach is doing its best to be a creature of God by being a cockroach (whatever notion of cockroach-ness you have, it applies). However, for a human person, it is more complicated because of the notion of transcendence. We are the only creatures in this Earth that are capable of such a feat.

When a cockroach approached my foot, I stepped on it--but I did not attempt to kill it. I let it go. Then I went inside to the lobby to talk to my best friend. A thought entered my mind and I asked it to myself and to her in the middle of our conversation: What if we kill the cockroach? Is that an evil deed--to impede the being of the cockroach to complete its cockroach-ness? What did the cockroach ever do to a human person to kill it? It's being innocent, not minding anything else but its being.

The two of us never had the chance to give a conclusion to this pondering. How about you, reader? What are your thoughts about it?