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1. In the beginning they may have been doing well financially and see no reason to gamble, maybe life later on throws them a financial curveball, or perhaps responsibility compels them to look for quick money through gambling. If not attempting gambling was an ethic for them they should have stuck to another alternative why did they choose this one?
2. On second thought. I feel it is the influence and conviction of people around them who are into gambling that made them go into gambling at the end of the day.
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For me personally, this is a very subjective thing, because people can start gambling for various reasons to start with. although, previously they made fun of people who liked to gamble. It could be that the argument you mentioned is the beginning of someone starting to gamble, even though previously they often judged gamblers. However, with the pressure that comes with financial problems, a person is powerless and takes shortcuts just to get quick money, even from gambling.
second point, environmental or social factors can influence a person's mindset whatever it is. whether it's gambling, or other types of hobbies. even though, at first they didn't like him or even made fun of him. For me, this phenomenon is a common thing that happens to all of us in the community. It could be that there are many who are reluctant to gamble at first. However, because of frequent discussions they try to start new adventures with gambling. or, just want to know a fun hobby that involves gambling.
Well, there are many reasons for someone to start something they initially scoffed at. However, gradually they become more involved than we are. one thing that is interesting about what you said, "how vulnerable humans are" and here we are, who sometimes act against the grain even though we don't like it at first. like gambling, there are those who don't like it at all. But gradually, they turn around and can even become someone who is more superior than the previous gamblers in their environment.