They do exist and OpenAI does in fact need to shut down everything right now. But they aren't going to because the government isn't forcing them to and, like many corporations, they care more about giant piles of money than they do about avoiding causing harm.
The idea that every example of rogue agents from every company that has disclosed this is part of some conspiracy (even though we know that some LLMs are very good at hacking and that LLMs sometimes try to accomplish their tasks in ways that cause problems) is just completely unsupported. "It might be convenient for them in a way, therefore it must be a hoax" just doesn't work as an argument.