Vampire Bats, to be Killed or Spared?

Should Vampire Bats be spare or killed? First, Vampire bats can control the blood of their victims. For example, Chris Krual the Journalist from Los Angeles Times, shares “A bats saliva contains an anti-coagulant that makes blood flow freely” (Krual). Thus, Cattle can unknowingly bleed to death. Second, These bats help produce medicines that are needed. For instance Chris Krual reports, the vampire bats saliva has anti-coagulant which is used to develop medicine to help prevent heart attacks. Therefore, Bats should be spared to so the medicines can be continued to be made. Thirdly, I believe the Vampire bats should be spared. To illustrate, Chris Kraul tells, the number of Vampire bat attacks on livestock