Writing fiction, whether it's screenwriting, novel-writing or any other format, is the ultimate, brilliant cop-out.
It's a playground for concepts that haven't graduated into being ideas yet.
You can speak through one character, then play devil's advocate with the next, all the toy with a concept that you haven't quite worked out.
Never mind essays - with fiction, there doesn't have to be a point. In fact, the weaker and more obfuscated the point is, the better the critical reviews. If you imply things, but come to no conclusion, people love it - because it prompts discussion.
Fiction is the ultimate playground for people who haven't made up their mind on something yet.
Especially for people like me - who never will.