The license included with Lua has proven itself to have no issues excluding minor concerns with what the license covers. There's no reason to change the license, especially to something as unprofessional as a "do what the fuck you want to but it's not my fault" license. The MIT license states that you must include the license with the software and that the authors aren't liable for anything caused by the software, which to me is the same thing as the above mentioned license, but with a more respectable wording.
Does it give some benefits to Lua authors?
Why not using extremely permissive license like the following: