Why does Hawking always warn humans, but he actively searches for aliens?

Maybe this is the duty of scientists. In order to protect human beings, they are willing to sacrifice themselves to find aliens. In fact, we have no way to verify whether aliens really exist. We cannot be sure that aliens will really exist just because of some books. In fact, sometimes science also has errors. I think Hawking's warning to humans is just to prevent humans from being too greedy. After all, greedy desires will devour you.

The reason why Hawking is so active in looking for aliens is simply to let mankind know that aliens really exist. Or to tell humans not to stretch their hands too long. This is just like in ancient tribes. If you always intervene in other people's affairs, it will definitely cause dissatisfaction in that tribe.

Hawking has indeed worked hard to explore the universe. We here should be in awe of Hawking. After all, his research has provided valuable research information for subsequent scientists. Regardless of whether there are really aliens or not, I think we should all have a sense of awe, so that we will discover more things.