You haven't given many (any) examples of violence or suggested any ways it can be stopped - which was part of the question.
Also consider the following opinions, with which you do not have to agree:
Wars are violent; there have always been wars.
Violence is not a recent phenomenon.
Violence is an innate human behaviour.
Violence is sometimes necessary - for example in restraining a violent person; in protecting an innocent person or oneself; perhaps in justified wars, unless you're a pacifist.