Every good parent feels that way, dear. It's just like falling in love. When you first fall in love the object of your affection is utterly flawless ... then 10 years down the road, you find yourself gleefully contemplating their slow torture and murder.
Think about it, if you weren't in love with your pet ankle biters you'd smother them in their sleep, what between their screaming, the need to continually wipe one end or the other and all the sleep deprivation. The only thing that preserves the human race is the absolute blind adoration a parent feels for their offspring.