The positiveness of censorship

Censorship is defined as an act or practice of censoring and deleting parts of publication or correspondence or theoretical performance. In my point of view nowadays censorship plays a crucial and vital role in the world. Why is this so? Censorship is the back bone in creating a positive society.
It could be argued that we all have the rights and freedom of speech. Every issues have the limit and boundaries. In my point , censorship is required in all the fields. First of foremost the categories of people who use the Internet are not only adults there are children too. Each site a child is accessed too has negative sites. The most common one pornography,what are these children exposed to. That is why censorship is crucial here. The games nowadays are games or violence stimulating actions planted in these young children's minds. Games use to be fun but now it is all about shooting and killing. The language used are vulgar and improper. It is so rude, what kind of culture are the children in the current era being brought up in. What has happened to the moral values we were exposed to by simple cartoons from the television.
In a certain country's view the politician tend to censor “sensitive” issues. Why is this done ? It is very easy to answer that they just want to the keep the country running just the way it is. Why do they want to create more problems. That way censorship is good in my point of view.