Being a responsible gambler involves more than just maintaining strict self control after losing, it also entails putting in place practical boundaries before things get out of control. imo techniques like self exclusion tools, reality checks & time or money limits, not only save money but also drastically reduce harm. sayin "if you lose but don't lose control, you're responsible" ignores the fact that mistakes are made before a significant loss occurs. Responsible gambling involves more than just keeping your sanity after a difficult time, it also involves being proactive, setting a budget & maintaining an entertaining mindset.
Being a responsible gambler is not as tough as people think, yes anything that involves money comes with lots of temptations that could make one greedy but if you're determined and set your standards then stick to I don't see why a gambler won't do it responsibly, "it also involves being proactive, setting a budget & maintaining an entertaining mindset". Also those stuffs you've mentioned are the characteristics of a responsible gambler and if any gambler can constantly maintain those principles then it's won't be tough being a responsible gambler.