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The instinct to care for offspring is very strong amongst all animals...except for humans who readily will kill their offspring ie abortion. Or they will neglect them and not care for them properly.
Nonsense. The instinct to care for offspring is completely absent in many animals. A turtle will lay her eggs on the beach, and then set off to sea with no concern for the little ones left to hatch and struggle alone. Seahorse mothers dispatch their eggs, then bugger off and take no more part in parenthood - the father will fertilise the eggs, then once he's released the tiny little fry completely ignores them. I've watched my catfish eat their own eggs after laying - presumably this would be less of a problem in the wild as they wouldn't be in such a confined space. Most animals take no part in their offspring's lives once they've been born (many take no further part following fertilisation) - parental care is the exception, not the norm.
Even amongst animals that do care for their young, it's not that rare for them to kill their own babies. Many rodents eat their young in times of stress or overpopulation.
Here's an article all about infanticide in brown rats, which discusses mother rates eating their own deformed young, or their entire litters in times of stress or malnutrition. Mother kangaroos have been observed to leave young to die in times of food scarcity, including removing young from their pouch that are not capableof surviving alone. Blue-footed boobies freely allow their stronger chicks to throw the weaker out of the nest, then abandon the losing chick to starve.
And in what sense do humans not instinctively protect their young just as much as some of our animal relatives? Most people will fight tooth and nail to protect their children, sometimes at the expense of their own lives. If they sometimes also kill or neglect them, this separates them not at all from the behaviour of other animals.
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