the question on where life begins is rather irrelevant until we answer the question of where the life of a chicken is supposed to end.
if the possibility that life may begin at conception is going to be a consideration when destroying eggs because they are male, then the same consideration must be made when we chose to eat eggs in the first place.
we can't argue that eating eggs is ok, but destroying them is not.
consequently, as long as we eat eggs the question of when life begins is not really relevant.
the relevant questions are: can we avoid destroying/wasting those eggs at all (can we eat them?) and if ee have to destroy them, what is the most humane way to go about it? my intuition suggests that destroying the eggs is more humane than letting them hatch