There is a difference between simple psychology and complex psychology. In the complex world we live in every aspect of life has to be weighed up against each other. Life is full of emotions and feelings that need to be considered and communicated in just the right way in order to keep people happy and healthy. A simplistic approach would be to just say 'don't worry'. In this case it would be true, but in the real world you have to look at the bigger picture and try to make decisions that are good for everyone involved.
A perfect example of a simple decision can be seen when you step out of your car in the morning. You may think that this is such an idyllic time to begin your day – the sun shining, the drive home feeling like a really enjoyable experience, and you are ready to take on the world. Then as you get dressed, your eyes decide something is wrong and you start to worry. By deciding not to worry you are exercising your brain's coping skills which are designed to protect you from worrying.
Another example of using simple psychology is at work. If you are at a meeting where there is a lot of discussion and debate, you could be one of those people who never really argue or disagree with anyone until they find themselves in a compromising situation. You wouldn't normally jump to that conclusion but somehow it comes over you like a wave. In this case simple psychology would be to stop arguing and start listening to what people are saying.
The same principle could be applied at home. When you are having a conversation with your partner about something that is bothering them and getting nowhere, you could ask them how they feel about the situation. If they respond by having a negative reaction, you know that you are out of the simple-minded mindset and should consider other ways of approaching the issue. Maybe there is a simpler way to tackle the problem.
However, when talking about issues that are more complex, simple psychology isn't always the best approach. In these cases it is important to be a bit more rational about things. At times our emotions take control and we become irrational. This means that we will often say things that are not necessarily true just to get out of a particularly difficult situation. By using simple psychology and logical thinking you are less likely to resort to this kind of behaviour.
Of course simple psychology . . . . . . isn't suitable for all situations and can even backfire on you if it is overused. You must remember that it is there to help guide you and not make decisions for you. If you do decide to follow a certain path be prepared for the consequences. It may not be the right decision.