Are fleas, head lice, and bedbugs extraterrestrial introductions to add to our miseries?

This is very much the case. They infest not only humans, but many useful animal species as well and are quite a scourge, both in terms of their annoying characteristics and their ability to carry diseases. The bedbugs are a perfect example of an insect scourge designed to be a genuine torment. The Extraterrestrial Alliance in their ingenuity and depravity will exploit creatures great and small that can be used to undermine human and the animal life they depend on. This includes the plant kingdom as well. There are many diseases introduced to be a blight for food sources across the spectrum, and this is yet another way they soften up humanity and weaken their foothold on the planet.