Why spay/neuter your pet?

[suparnikkay]

I'm not saying it's a bad idea, and I definitely agree it's the responsible thing to do. My question goes out to those that feel it's irresponsible not to spay/neuter your pets. Why do you feel it's so important to do that to your pets when you don't feel the need to do it to yourself? Think of all the starving children in the world. Do we need to populate the world more? Again I'm definitely for spaying and neutering your pets but I'm just curious what people's thoughts are on the subject.