Something I Thought Of Typing Last Night's Post

Maybe it's because he does care for her, or maybe it's because he doesn't regard her as a threat to his plans in the slightest, but I think Dana's going to be the one who ultimately brings down Doug and his "10,000 Jokers" plan.

He doesn't particularly listen to her concerns, but he also doesn't lash out at her, which suggests she could get close enough to him to try and get him to listen to reason. Or, from another perspective, he's so dismissive of her as being a possible obstacle he'd never see her coming. With his, "batman will be about as much trouble as my sister Dana" comments and all, I think he may find he's underestimated her a bit.