Even if the people behind the USHCN/GHCN/GISS/NOAA data tampering believe that what they are doing is scientifically legitimate (and I have serious doubts about that) – they are misrepresenting their product as thermometer data.
They take a measured cooling trend, convert it into a warming trend, and then publish it as if that warming trend was the actual thermometer data. It goes to the press with no warnings, and no graphs of the original data.
This is blatant product mislabeling and fraud. It would be the equivalent of a CEO presenting a bogus profit trend based on his theory of what would have happened if he had a better accounting department.
With four parameters I can fit an elephant, and with five I can make him wiggle his trunk.
– John von Neumann