Clearly, Steppenwolf represents themost fomidable villain we have ever seen across film- super-hero, comic, or other.
Look atX Men- see what they didwith Isaac as Apocalypse? "Bringit all down and we will build another!"
His forces plant their para-demon seed into females and this is to spread their kind.
Steppenwolf spells it out: There are no protectors here. No Lanterns. No...Kryptonian. This world will fall...just like the others. This is brilliant, matter-of-fact dialogue.
Audiences can't handle too much horror... so Whedon was brought in to PG the thing, kill off Steppenwolf, and sell more toys.