13 Unanswered Questions From 2016's Comic Book Movies
4. Where Were All The Justice League Members? - Suicide Squad
The Question: This question gets raised in pretty much every major superhero movie with notably absent characters, but while Enchantress (Cara Delevingne) was wreaking havoc in Midway City, where the Hell were Batman, Wonder Woman and The Flash (Ezra Miller) in particular?
The Likely Answer: There's not really any satisfying answer here, so fans either have to settle for "they were busy", or just accept that Warner Bros. didn't want to spend more money to throw more CGI-heavy superheroes into the mix and also risk them stealing the spotlight away from the titular villain group.
In both the Marvel Cinematic Universe and DC Extended Universe, this will be an issue moving forward, so it's best to just get used to heroes being conspicuously missing a lot of the time.