1. Appealling for a catch when you know the batsman has not hit the ball = Cheating
2. A batsman not walking when he's knows he's out = Cheating
3. Fielders deliberately altering the condition of the ball = CHEATING
All teams openly transgress the first two, not occasionally, but every single Innings of every Test Match. Both are blatant cheating. Yet to be accused of number 3 is to have a slur on your Country likely to cause an International Incident. Why the big difference?