The users forum over there seems to be working on getting autoit unflagged by AV companies. Since by their own ad mission Virus writers use this language to create virus and malware, I seriously doubt that's going to happen any time soon.
I was not aware of the malicious use of this language. Like the idiots that fly model aircraft outside the boundaries of good common sense, that give the rest of us fliers a black eye in the face of the FAA and others, you're going to have those that will make bad use of a programming language. But the language shouldn't be blamed. Just what is created with it for evil intent.