I think she's going to do that, now. Harry wasn't very nice, but nice wouldn't have helped - more the opposite, I think.

If he hears them, he might find a way to use them that'll be harmful - if he does anything public, that wouldn't be so bad because Harry would react the same way he would if Hermione would go public, and it would look ridiculous, like Lucius was just trying to get back at Harry for "gaying" his son or something like that.

I thought so. Would be very stupid, and Harry is anything but.