Freedom of speech is a cultural value, it's not something strictly defined by the US constitution. It's the reason there is a constitution not the other way around.

There's a lot of incorrect things in this, but to address the incorrect thing most relevant to this discussion:

What you are asking for is called compelled speech. If what you think "free speech" is were true, the government could force newspapers and online news websites to publish articles written by the government that they do not agree with.