Well the ethical problem with eating eggs is not the fact that no one died laying that egg or that it's a future baby chicken inside. it's not. it's a chicken period, a menstruation (to the person above me, it still is an unfertilized reproductive cycles, just like in humans.)
the real ethic problems with eggs are :
-male chicks are ground up, more often than not alive, because they have no commercial values.
-female chicks have their beaks cut off, with no anasthesics, by hot metal plates
- most egg production puts the laying hens in terrible conditions. if you think "grass fed", "free range" and the likes matters, it usually doesn't. they still have the same terrible conditions for most of their lives.
-hens are killed as soon as their production diminishes, which is not many years. just like milking cows, they are slaughtered at 1/10th of their life expectancy.
on top of that, it's just bad for you. loaded with cholesterol, saturated fat, salmonella, etc.
if you are into ethics, just do a little research and you'll be disgusted by eggs pretty fast.