There's no "need" for government to do anything, at least using the language you use. Government, in and of itself, comes from the factory with no rules. Government does what its people want it to do. It's like my computer has no "need" to write the words I write, or use the programs I use. I have set the parameters that my computer operates with. Same with government. The people set the parameters for what they want. So the people wanted someone to control language over the airwaves. It was caused by certain broadcasters exceeding the bounds of decency. In society, someone had to play the part of the referee or umpire. There's no "need" for that person unless we determine we want such a person.
In a real world, a practical world, a world where people don't ride unicorns, the problems of total chaos are so clearly self-evident that only a sophomoric troll would attempt to sell the argument that there is no need for some degree of rules. I suppose that's why you put the word need in scare quotes.
There is a need to ensure that once one person is transmitting on a particular frequency, other transmissions don't interfere. That's why stations need to be regulated as to what frequency they are allowed to use, how much power they're allowed to broadcast, etc. Such regulations are often recognized as being "common sense", a scare commodity nowadays, especially in this forum.
As for "the people" wanting someone to control the language over the airwaves, that's hogwash. The original purpose of regulation of broadcasting was to maintain proper controls over the technology, as I just mentioned. It was the action of enterprising pressure groups who persuaded the government to get into the censorship business. That's one of those things that a small, but very vocal minority demands while the vast majority of people just don't give a damn about.
The FCC has a place in telling a radio jock that he can't drop F-bombs on the air. They don't have a place telling him that what political views he can espouse or what guests he has on the show.
No, the FCC
assumed that role. They serve as content police because they want to, not because a law says that they have to. The law created the FCC and gave them the power to write regulations that had the power of law, though they were not, in fact, laws. That's the case with most regulations promulgated by Executive Branch bureaucracies. That's also the sort of "big government" that both libertarians and conservatives have a problem with.
And to the best of my knowledge, they've never done that.
Then there are some big holes in your knowledge.