yes because it's easy money, and easy money does not lead to a good one.
There are a lot of ways to earn easy money and Gambling is just one of them. Gambling is a game of luck, it will not ensure you a good profit or a great amount of money but it will ensure you addiction and regret if you don't control yourself.
Most of the people negatively portray Gambling since there are a lot of people that is destroyed by this in our country. With a lot of lesson learned experiences, most of the parents are keeping their children to avoid using their money on gambling.