We do the same thing to plants. Why do you have no qualms about killing plants to eat the food they accumulated for their young?

A grain of wheat and a chicken egg are evolutionarily and nutritionally, maybe even ontologically, indistinguishable from one another.

2) Multiple things can be horrible at the same time. Being upset at this doesn't diminish the atrocities happening elsewhere (like war, genocide, slavery of humans). We can hold multiple things in our heads at the same time.

3) This has nothing to do with the conversation or this domain, but because you're bringing it up, I also have ethical concerns about the experience animals have of their own existence, and reduce or eliminate my consumption when possible.