Based on what I have witnessed in some compulsive gamblers, they usually see some of all these signs when they are gambling but they ignore it and don't bother to make a correction, they keep ignoring it until they can no longer control it because it has become a habit. At least if a gambler begins to notice all this symptoms, they should either take a brake from gambling for some time or seek a advice from someone that can help them.
They're aware of the signs of gambling addiction, but still lack self control. A responsible gambler with a plan would recognize when they are losing too much and take steps to prevent addiction, without needing from others. As the saying goes, A good person advises themselves after all self reflection and introspection can be more valuable than advise from others.
You're right, self control is the major thing that is causing some gamblers to be addicted to gambling because they don't know how to apply stop to their gambling to continue the next day, than to finish all the money on gambling which is a bad habit to anyone that have such habit. The moment you are addicted to gambling, you will not know when you are losing until you loss all your money before your eyes will be open to know the damage you have done to yourself, because the gambler ignore some strategies that would have make he or she to avoid losses in the gambling.
Once you ignored professional of gambling advise, it's the sign of addiction to the gambler because he or she will be thinking that what he or she is doing is the right thing until he loss everything in gambling.