But cannot really be put into the same basket in all aspects. Science is defined as an intense and systematic study of various fields, which in turn can spur great inventions, advancements and discoveries.
To kill is to cause the death of a living being, or an end to something non living.
Sure,certain scientific studies have today made the act of killing someone easier via sophisticated weaponry and improved methods,however advanced studies in the fields of medical science and industries means people are now not only enjoying longer and healthier lives, but more comforts and eases as well.
Safe to say then,science doesn't kill, people kill.. better owing to scientific advancements!