Why does the USHCN keep moving the goalposts?

Newly found weather records show 1930′s as being far worse than the present for extreme weather

Analysis: Claim that last 12 months is warmest in US history is not surprising, because USHCN is massively cheating – by adding 2.5 degrees on to 2012 temps relative to 100 years ago

'They have some massive data tampering going on after the year 2000. The US temperature record is corrupted beyond comprehension'

All Claimed July Warming In The US Is Due To Data Manipulation

USHCN has adjusted recent US July temperatures upwards by 1.5 degrees F, relative to the 1890s. The adjusted July graph shows about 1.5 degrees of warming since 1895'

Anyone who has studied the data for a while realizes that since about 1998 the 1930s temperatures have dropped about 0.3^oC. Since the current temperatures are compared to historic temperatures that makes current temperatures look higher and current high temperature records more numerous. Why is the USHCN doing and how can they possibly think this is honest?

I used to play football - there is a football term for this - moving the goal posts. In any other field of endevour the people involved in this would be fired for dishonesty. Why is this tolerated in the climate field? If they are going to cheat and lie - why should we take climate science seriously? Climate science in its current state appears no more accurate or honest than astrology.