If government employees are going to alter data to reverse measured cooling trends into warming trends, it is absolutely essential that each and every graph is clearly marked as altered. Otherwise, people might accidentally confuse it as being legitimate.
And if you point out that they have altered the data, they use their government funded salaries to publicly say that your analysis is faulty. These aren’t my graphs. They are NASA graphs. It isn’t my analysis, it is NASA’s analysis.
Obviously we should just blindly accept everything government employees say.