People have good intentions. They get pets and think they can, take care of them. Many times things happen and they find themselves, giving the pets away. In this economy people can't eat and have to sacrifice their pets. It isn't a character flaw, just money could be tight and they are having money problems.
Some people get pets thinking that it will be no problem for them and that they will be able to handle them. Sometimes, though, it becomes apparent that they cannot care for them. It is better that they find new homes rather than abandoning them.