Why not attempt to save Apon and Dietrich?
After the first encounter with the aliens, Hudson pointed out that sergeant Apon and Dietrich were still alive. I expected Ripley, who knows what becomes of the live victims of the aliens, to be the first to insist on saving them, but she said coldly "You can't help them. You can't. Right now they're being cocooned just like the others". Yet after Newt was taken, Ripley did her best to save her from the same fate.
Were the lives of Apon and Dietrich cheaper than Newt's?