Who is to blame?
There are often times when people try to blame everything on the demon, and avoid personal responsibility completely. I believe this is possible in extreme cases, but it is usually not the case.
Let’s take a closer look at a spirit of anger. These spirits can cause a person to experience urges and feelings of anger. If the person gives in to those feelings, they can be found doing things like King Saul when he was about to kill David by throwing a knife across the room at him (after evil spirits have attached themselves to Saul). If a person has uncontrollable anger problems which they cannot seem to overcome, then I would suspect that a spirit is likely behind their struggle. But there’s also a level of personal responsibility to where a person shouldn’t be willfully showing their anger on the outside by being violent and then blaming it completely on a demon. It’s one thing for a person to struggle against urges and feelings of anger, but another for the person to act out on those feelings. However, when a spirit is present, it becomes MUCH harder to control one’s actions.
I also believe it is possible for a person to come under the demon’s control, and in those cases the demon manifests directly without the person’s will being involved, but this is a much less common scene (at least in the United States). An example of this would be the man in the Bible who had the legion of demons…
Luke 8:29, “For Jesus had already commanded the evil spirit to come out of him. This spirit had often taken control of the man. Even when he was shackled with chains, he simply broke them and rushed out into the wilderness, completely under the demon’s power.” (NLT)
However, in most cases (at least in the United States), I believe that the person has the ability to control their anger problems on the outside, even if a demon is involved. On the other hand, if a person has a consistent struggle against anger, then I would suspect a spirit is present and should be driven out. It is not normal for a person to struggle against urges and feelings of anger.