many gambling addicts have lost their minds because their desire to continue gambling overpowers their common sense, hence the importance of "gambling responsibly"
Ironically when there are people who cannot control addiction in gambling, this is just a small example of many gamblers that ended worse and there are some who end their lives because they are in debt when gambling. Gambling is responsible when you are not addicted and when it cannot be controlled, in my opinion it is difficult to be responsible for gambling choices.
The problem is how you put gambling, if done only for fun in spare time is not a problem. But when gambling is done as a substitute for permanent work, this will be far more problematic and it is very difficult to control, the decision is in each of us and as much as possible avoid addiction in gambling.
Gambling don't have responsibility over the players. Players have the sole responsibility over themselves and their gambling habits. It's not as if gambling games can adjust to a person's need or want. It's our decision whether we will play and bet or not. It's just that, sometimes people go overboard their capacity that leads them to being addicted in the process.
Addiction is a serious matter of dependency on gambling because of the thrill, excitement, entertainment, and/or profit it brings. If a gambler won't set limitations and boundaries on to what extend he will play and spend money, there will be a high chance that he'll get lost in the process. And when this happens, chain of negative reactions occur in a person's life such as losing cash on hand, savings, and even being buried in pile of debts. From there, some people become depressed, anxious, and even have suicidal tendencies. Some people resort to doing bad things just to sustain their gambling habits. And this is where professional intervention must be done in order to make gambling madness into full stop.