If we breed more cattle - I can get a cheaper steak
for whom or what might it be "better"/"more moral"
if animals come into existence?
It would be better for:
1/ That particular animal
NO. "That particular animal" didn't exist prior to
existing, so coming into existence CANNOT "benefit" it.
2/ Animal Kind
No such thing.
3/ My sandwich
No one cares.
4/ World as a whole
Bad answers, as I expected, and as you knew you would