I'm not sure I'd call it stupid. I have no doubt I'd fall for the same trick.

[Not that she'd ever admit this when she was alive, of course. She was smarter than that. That's what she always told herself. That was the standard she always held herself to.]

[But in the end, this is what she was. Another idiotic hero.]

I doubt it. Something must have prevented them from realizing. If it hadn't, don't you think we would have seen Vash and Takame by now?