I choose not to give a **** about her portrayal in Bvs and JL. She's a hero in that movie and that's all that matters.
Notice how I didn't restrict my analysis to just BvS or JL, though. I said, "she refuses to help Steve or humanity because of her mistaken beliefs." Diana does that in the
Wonder Woman film after she mistakenly kills Ludendorff believing he's Ares and is in despair that humanity is still engaging in warfare despite his death.
-If you believe that this war should stop if you want to stop it help me stop it right now. Because if you don't, there will be thousands more. Please, please come with me. I have to go. [...]
- Where is Diana?
- We are on our own.
So, if you want to reject BvS and JL, you'll have to reject WW too.
It still bugs me how Wondy's decision to step away from humanity is totally at odds with how inspired she was by Steve's death. Best to pretend BVS and JL never existed, I guess.
Also,
jmc and
BestGirl, Diana was a hero in BvS and JL too, just in a different way. I never said she wasn't a hero in those films. I said she was disillusioned from a state of utmost naivete. Before, Diana believed that humans were blameless victims under Ares' sway, and that it was Amazons' sacred duty to defend the world. She came to Man's World with that belief and charged ahead throughout the film showing most humans mercy because she believed they deserved it. The end of the film is the first time she has to shift her belief from helping humans because she believes it's her divine duty and they deserve it as blameless victims with no free will, to helping them because she believes in humans' inherent goodness and agency and thus their ability to choose love.
So that gung ho attitude of hers that is said to be liked so much in the film is one the film -- not BvS or JL -- has her lose by the end of it. It chastises her for it. She chose to kill Germans instead of the Allies because she decided the Allies deserved her protection; yet it was the Allies who were being supported by Ares in the form of Sir Patrick. Ares paid for and supported her, Steve, and his team's mission precisely to manipulate Diana and prime her for temptation. To be clear, if Steve inspires Diana to believe in humans and their capacity to love, then that implies that Diana didn't feel that way before.
It's also important to understand that Steve's inspiration wasn't about public superheroism. What Diana did, and what BvS and JL suggest she did, was serving humanity and supporting their free will to choose love by helping humans in the shadows. She wasn't a public symbol like Superman was. That doesn't mean that she wasn't heroic. She chose to step away from a hero who got her picture taken with her human allies because she believed that humans and gods should stand apart; so that humans would be free to make their own decisions. Like she said at the end of the the movie:
I used to want to save the world. To end war and bring peace to mankind; but then I glimpsed the darkness that lives within their light. I learned that inside every one of them there will always be both. A choice each must make for themselves something no hero will ever defeat. And now I know that only Love can truly save the world.
Finally, having confidence and clarity isn't inherently a good thing. Bruce had both, if you'll recall, when he thought the right and heroic thing to do to protect Earth was to stop Superman, just as Diana thought she had to stop Ludendorff (Ares). Steve Trevor, like Jonathan Kent or Alfred Pennyworth, serve to provide an alternative point of view that challenges Diana, Clark, or Bruce respectively to consider other possibilities. Jonathan only warns Clark that revealing to humanity that aliens exist has the potential to destabilize the world. Look at how Diana reacted when her sense of the world came crashing down. Look at Zod's. Diana reacted with rage against humans, and Zod became angry and suicidal. He also, through his parable about saving his family farm only to flood the Lang farm, teaches Clark that sometimes doing one act of good might mean living with the nightmares that come from the unintended consequences.
There is nothing wrong with Superman, Wonder Woman, or any hero approaching heroism with enough wisdom to know that decisions aren't always easy to make and what is the best thing to do isn't always clear. There is this great quote in the film
Darkest Hour about Winston Churchill that's earning accolades this film awards season which says, "You are strong because you are imperfect. You are wise because you have doubts." Churchill's wife says this to him when he needs encouragement. I think it suits the heroes of the DCEU quite well, and it's a valuable lesson to teach all of us.