There are other reasons people gamble too. Sometimes they gamble to socialize, or to relax, or to distract themselves from other things they have to do, which is never a good reason. Some people also see gambling as a form of entertainment, like going to the movies or watching a hockey game.
There are different perspectives on people's involvement in gambling and maybe they initially had an excuse in some way before becoming addicted and even people who are currently addicted to gambling also initially never imagined that it would lead them further into the cycle of addiction. If gambling is considered a place to make money then the person will unknowingly become addicted slowly because initially they think they can recover their previous gambling losses and that is why it is difficult to recover people who are already addicted if they do not have control from their closest family.