I don't have the early PMs anymore, but if I remember correctly, our kills were made for these reasons. Correct me if I forget something, mates.
Night 2-
TEW: We thought there was a chance he was
some sort of Gifted, if not the Seer. We noted he'd used the "Sting" and I think the "Leaf" icons, and thought he was as good a choice as any.
Night 3-
Sally: We settled on
Sally because we thought she was acting odd in general, and
Boro had gotten the hints she'd made about him. We also did not think she was likely to be protected.
Night 4-
Kitanna: We were hoping she might be the Ranger, but again the thought of an unlikely protection was the main draw.
I wasn't part of the discussions Night 5.