All does not mean that television as a source of violence, only a single source, but it is a great source, not least parents can protect children from being influenced by those tv shows.
All this does not mean that Television is the source of violence is only one source. But it is not less, parents can prevent children from being influenced by the television show them.
Not all means. Television is the source of violence, only a single source. But it is a big source of not less parents can prevent children from the influences from the TV show them.