I think its not hard to be a responsible player, but its hard to build «past» to be prepared to be responsible. From my vision, a person who has enough money, knows lots of ways how to earn them (not only in theory), have stable income, can gamble responsibly and greed will never lure him to dark side. Its not easy to become such a person, but if someone managed to become like it, he wont have problems with gambling.
If it's that easy to be responsible gambler, I wonder why there are many gamblers out there that are losing money because of wrong decisions.
Being a responsible might be easy, but in reality, it's hard. Gambler can change their mood from being responsible, to being greedy in an instant especially if they're winning consecutive times already. Most of the gamblers aren't contented with their winnings, and they always have this feeling where they feel that they can win more after maybe doubling or tripling their money. It's hard to be a responsible gambler for most because of their mindset as well. What I believe is that, if we are responsible outside of gambling, we can carry it over, and be responsible as well in gambling.