Why are there so many idiots out there breeding animals?

why do so many people not spay and neuter? If you " can't afford it" you should have a pet, plus it will cost you a lot more to raise the babies. BREEDING KILLS MORE ANIMALS THAN IT BRINGS INTO THE WORLD!!!
Update: by breeding kills, i mean that for every animal you buy, one in a shelter stays in a shelter, often times being killed.
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