I tell you this because just because you can kill, doesn't mean you should necessarily do so if the situation doesn't call for it. Very often, yes, the situation calls for it, but there are many more things that are resolved both better and more ethically with a binding ritual than with a death ritual. Not everyone deserves to die!
Poppets serve as a creative medium. They help to manifest intentions/desires and bring magick to life by acting as effective focal points for directing energy through the mind and soul. Some individuals may find it easier to channel energy with the aid of specific tools or props. Though, the true success lies within the strength of one's own mind and soul, regardless.