Of course, Gambling should be playing with care because in gambling, most of the time you will take the loss and you should spend money in gambling that you can afford, which means you need to spend money 2% to 3% in your gambling from your monthly income.
Since it's our personal money we are using to gamble then i don't think there is much need to keep repeating to people why they needed to exercise caution and care while gambling, had it been that you gamble for free, then we may assume people are gambling out of care because they never know it worth, since they are not using their money to bet, so that alone should be the reason why gambling with care should be inherent behavior of every gambler to do the right things and make the best choice in gambling.