I'm planning to smother the small, fluffy puppy.
You wouldn't really smother a puppy, would you?
No, I would. Two reasons: It's cute and it's spending energy we need for survival.
Those are not valid reasons to kill a pet. Their energy expenditure is unrelated to the energy capacity of society. Their cuteness benefits most people, so what you're proposing is misguided to say the least.
It's a good idea. It will deteriorate the moral fabric of the human race.
If you smother the puppy, you are likely to get caught and end up arrested. Also, when people find out you did this, you will have much trouble finding any friends in the future. Don't you think it would be better to just leave the puppy alone?