And last, but not least, if you take a closer look at all other kinds of violence, you will always find psychological violence there.
To be able to use these other kinds of violence, psychological violence is always a handy or even necessary tool (such as blaming, blackmailing, humiliating…). And, on the other hand, we have to take into account that there are always psychological effects in all kinds of violence.
On the other hand, in the Cycle of Abuse, that describes the three stages how the violence keeps repeating in a relationship, you can see that the key for the Honeymoon Period to work (and for the victim to believe the perpetrator and stay in the violent relationship) is also the psychological violence, through lies apologies, gifts, etc…