Why do wasps sting people?

The stinger of wasp is an abnormal genitalia, which is not only connected with poisonous glands, but also connected with many internal organs. When a wasp stings a person, the poisonous needle will stay on the skin. Naturally, many organs connected with poisonous needles, such as poisonous glands and internal organs, will stay. At this point, the poison glands keep contracting and inject venom into the skin. A wasp that has lost many important internal organs will soon die of physiological failure.