Gambling can affect self-esteem, relationship's, physical and mental health,work performance and social life. It can harm not only the person who gambles but also the family, friends, workplaces and communities.
Maybe you should just be specific. I am a gambler, and I don’t have any effect on my family members or community. The only people from whom I know that their gambling activities always affect them or the people close to them are the addicted gamblers, they are the ones that do crazy things just because they want to gamble, and their activities are affecting people negatively. Addicted gamblers activities are the ones that make society have a negative mindset about gambling, but I don’t see anything bad about gambling, just that we should try not to be addicted to it.
Where the environment like our environment must try to match. If we swim against the current, we will never reach our destination. If we feel that the people of the society we live in do not look favorably on gambling then we should keep our privacy and then gamble. You may think that it doesn't matter to you what other people say but when you are in danger, people in your society will say worse things against you. Since you are gambling with your own money and risking your own money, why should you unnecessarily be bad in the eyes of others? Since there is an opportunity to gamble with enough secrecy, I think we should gamble with this secrecy so that people don't get a bad impression of us.