You know what I want?
I want in the Justice League movie for Diana to see the Robin suit in the Batcave, ask about it and have Bruce walk away silently.
I want later in the movie for her to say, “I’ve lost friends in wars before.” And I want Bruce to respond, in the most pained voice, “but have you ever lost a son?”
I want Alfred talking about it with her, telling her what happened.
I want acknowledgement of Jason Todd’s death as Robin in the Justice League movie.
After a particularly violent exchange between the famed new criminal Red Hood and the vigilante Batman, which resulted in Jason getting a little too close and personal with the sharp end of a batarang, Bruce sets out to check on his son. Still bitter about Bruce’s refusal to kill the Joker Jason is putting all of his effort into hurting his former father figure while avoiding the rest of his family.
Notice how the Joker has every reason to be killed by Batman in the DCEU.
We saw Batman kill. He already crossed that line. He doesn’t have the excuse of “it’d be too damned easy.”, he couldn’t make that speech to resurrected Jason, claiming that killing is bad when he did it himself.
And we know he attacked the Joker, he was the one to punch all the teeth out of his mouth for killing Robin, he fucking let him drown in the car chase scene in SS, when he took Harley out of the water and gave her CPR (which implies that Harley wasn’t actually associate in killing Jason, or else Batman wouldn’t save her.) the joker didn’t die right there because he was needed for the plot of one movie (and also he’s a cockroach who won’t die unless you shoot his head.)
Which brings me to the behind the scenes reasoning: people hate the current DCEU joker. In almost every other media the joker is stanned, people LOVE him. He’s so goddamn popular, DC can’t bring themselves to finally kill him.
But here? DCEU Joker is hated. The actor is disliked (to say the least) by his cast members, and the audience, and apparently the movie editors as well. It wouldn’t be a shame if he were to die.
TLDR; Batman kills in the DCEU. The Joker is a hated character. Make it happen, DC!