As WIY points out, there is missas neshika. Also, see Chagiga 5b concerning the malach hamoves sending out shluchim.
nem621 – Whilst it is true that many acharonim (e.g. Chazon Ish) do say your sevoro, there are shittos that hold that you can kill someone even if HKB’H didn’t ‘want’ (k’vayochol) them to die. The Or Hachaim says so, as does the Zohar and Rambam, so it’s not a ‘kabbalistic vs. rationalist’ thing. It’s rather complicated and so the CR is probably not the place to discuss it.