Television news isa vital source of information in all over the world.
It is debatable that the television news shows various disaster and violence videos.
... your prompt does not suggest that this is a debatable issue. It asks your opinion about possible effects of this scenario to the society. Always keep alignment with your topic. My suggestion;
However, they include many disastrous and violent video clips that can have a great impact to the society as well as individuals. .... now this statement is aligned with your prompt :)
... why not support this idea with a specific example such as recent killings in the USA by a student. Your examples would earn points :)