Why do people who have absolutely no business owning a dog get one?

And why do people get powerful breeds (mastiffs, rotties, pits) if they don't have the adequate home/lifestyle/leadership? And why don't people spay and neuter their dogs? If they aren't show dogs you have NO reason not to! Don't breed your dog because it's "cute"! You have NO right to when hundreds of dogs die in shelters every day! Why as humans have we let dogs down so much? Look at the shelters if you don't believe me...