When you have a positive mindset about gambling it means that you are gambling responsibly and not falling in the mental trap of being addicted and you don't try to make it a source of income
Not really.
Having a positive mindset doesn't mean one is responsible in gambling. You can have a positive mindset and still be ignorant and greedy in gambling, ultimately becoming addicted to it. Anybody can have a positive mindset in gambling, including both gamblers who are gambling responsibly and those who are not.
It makes sense when a gambler is responsible and has a positive mindset, but when a gambler is irresponsible, having a positive mindset is of no use; instead, it can lead to overconfidence in gambling.