I couldn’t agree more, the common mistakes gamblers do is they lose their calmness and as a result they tend to make bad decisions which will of course may result to a bad outcome. It’s good to take a break for a while for you to be able to think carefully and in that way you’ll be able to think of a better strategy.
What I don't understand is when people are trying to force a win. They lose a few times and then they get angry (with the world apparently) and make a bet where the probability to win is very low to none existing... usually it ends up with them losing that bet as well.