Because to the general public, LLMs are an example of Clarke's Third Law. Most folks, who are not remotely close to even a basic understanding of how LLMs operate at a technical level and only view their output cannot possibly evaluate what they're experiencing other than to believe it's conscious, alive, and/or magic.

Most people on Earth try to put what they're seeing into the context of what they understand; mental gymnastics to try and understand what is happening based on their prior experience. They have absolutely 0 understanding of how it works under the hood so, to them, it must be alive.