Scans_Daily

It's not so much that he thinks he can take her as that he has no choice but to try; he's as bound by his oaths and personality to seek Justice for Dani's victims (no matter what kind of men they were) as Diana herself is bound to protect Dani. Which is the whole point of the story, it's very Greek tragedy that way.

If you take it out of that framework, though, it works too; you can argue pretty easily that Bruce obviously doesn't want to force Diana into anything. He has zero chance of going through her, and he knows it, but he's got at least a minuscule chance of going around her, so why does he try to go through her both times? Because he doesn't want to do that to her. He wants a solution they can both live with that doesn't involve strongarming or betraying the culture of a respected friend. He's just not entirely conscious of that, or doesn't know how to ask for it, or some combination of the two, so he makes a self-sabotaging attempt at unilateral victory instead.

Ultimately, his vision of justice has more shades of grey than her oath, so given time to work things out, she could probably have satisfied him that a lifetime of being, basically, Diana's slave, is an acceptable punishment for her crime, and he'd have let it go. But the Furies wanted their tragedy, so they pushed Dani to suicide before Bruce and Diana could get that far.