why some other parent's like to abandon thier kids?

There is a difference between abandonment and giving a child up in hopes of a better life for that child. Some people are not emotionally equipped to deal with raising a child, others simply do not have the skills or ability to obtain those skills to earn a living that would support a child in the manner one would hope to. Some people are addicted to substances which may make them unfit for a time to care for a child, some can even be dangerous to dependents. Not everyone is too lazy to find a job, there are thousands of homeless in America who work yet can't afford housing. Rather than subject their children to living in conditions less than optimal they 'abandon' said children in favor of housing, food and the things they believe their children deserve. Some people have mental conditions, personality disorders which make them unfit and possibly dangerous to dependents. Things aren't always as black and white as they appear.