Well, for the obvious reasons. The first one being they're paid to lie about them. The second being they may not even realize they're lying.

Most of today's "journalists" being the product of a government education. The process instills in them an instinctive urge to hew to the orthodoxies, which they immediately apprehend without having to give them thought. They must be true because they would not otherwise be orthodoxies. Imagine a herd of geese. One begins to honk and flap its wings. In short order, they are all honking and flapping their wings.

Such geese are ideally suited to honking and flapping on behalf of the government – and the corporations that own it.

For example, this "news" story published the other day by CNBC, which gives you the orthodox take on the facts, rather than the facts, themselves: