> I am OK to kill a cockroach
I don't see where our disagreement is then.
> inflict unnecessary suffering on it
I don't believe I've said anything to that effect. Perhaps you're insinuating that based on my dismissing of the well being of roaches. My statement is in the context of this thread, using lasers for pest control. I'm saying it's ridiculous to worry about the well being of roaches in the context of pest control. Besides, I would think lasers result in instant death which is more humane that most pesticides.
> Unkindness to creatures inevitably results in a devaluation of all life, including human life.
I would agree with that to an extent. If you think pest control falls under the category of unkindness, then I would disagree because if you think that, you're valuing roach life more than human life. If that is your value, you have a right to that belief, but I vehemently disagree.