Viola Davis lets her Charles Bronson flag fly in “Lila and Eve,” a ludicrous revenge thriller that should have been called, “Stop! Or My Mom Will Shoot.”

Davis plays the mournful mom of a teen slain in a drive-by who, after attending a support group with another woman (Jennifer Lopez) in similar straits, shakes off her sorrow and picks up a gun.

The two middle-aged women improbably go storming into the night looking for bad guys in whom to bust a cap or two, as director Charles Stone III completely fails to convince us that this meek pair could turn into steely-eyed vigilantes.