Justice League vs. Suicide Squad

It is hinted in the credits scene that such a confrontation is possible in the DCEU. And that even if the Suicide Squad (in its current version) stands no chance against a team of actual superheroes (minus Batman, who is just rich).
However, this isn’t the question. Amanda Waller decides that it’s better to employ the services of villains rather than the services of heroes. How come? Of course, the villains are expendable – but this is not an argument, especially since the villains can go rogue and create even more mayhem than the villain they are sent after. Just like it happens in the movie.
Amanda Waller knows that there are other metahumans in the world. And she knows that some of them actually do good, without coming into the spotlight. Flash is the best example here. Maybe she should have formed a Justice League, instead of a Suicide Squad.
Don’t you agree?
