What is the truth about "Job Killer" claims?

According to Huffington Post article out of the 381 articles posted in the Wall Street Journal, Washington Post and New York Times, the phrase "Job Killer" was NOT substantiated -- backed up with facts.

The University of Northern Iowa Study says:

"The news media's chronic lack of fact‐checking has only encouraged ramped up use of the 'job killer' allegation as a political strategy against the Democrats in recent years," the study says.

A Politifact story says:

"The Congressional Budget Office (CBO) estimates that the legislation, on net, will reduce the amount of labor used in the economy by a small amount—roughly half a percent—primarily by reducing the amount of labor that workers choose to supply." 

So why is this so important?

With politicians repeating the phrase "Job Killer" without ever questioning that statement, then lazy reporters just regurgitate the phrase acting as if the evidence has already been proven -- acting as if it is an established fact -- when in fact it has not.