if you get angry or if gambling has an impact in your mood or behaviour this is not a good sign on my opinion.
you must stay calm and have fun even in case of a loss. Moreover these reactions are situation where they are trying to mask the necessity of a win for having money. No If you gamble for making money and not able to bet wisely well, there is a problem here.
You right though, but one thing about gambling is that it has an uncontrolable spirits where they wouldn't mind continue gambling and can't know when to stop and when not stop until they are being drained entirely.
Gambling for fun but must have this mind of controlling ourselves while gambling and know when not to go above our limits, that is why whomever that can't control their feeling or not even taking it as a fun purpose such person's usually ran into issues.