The entire concept of a Suicide Squad

How in the world could Diablo save the world from an evil Superman? This is the question one should ask as soon as Amanda Waller presents her plan (I’m leaving aside the fact that her team of superbadass villains also includes a guy who is good with ropes and another guy who throws boomerangs and I am asking just about Diablo, the only superpowered being from the entire Squad)
It’s pretty obvious that the script wasn’t even read when the shooting started. Otherwise, the studio and the director (yeah, the same guy who wrote the script) would have considered some other characters from the comics who actually have a shot against superpowered beings. Deathstroke? Parasite? Bane?!?
Nah… here’s a guy called Killer Croc, who is actually some dude with a skin disease…
