This is like scousers moaning only United get far more dubious penalty calls than any other.
Let's see, Only issue of contention with Lankans is Murali's action.
With India, you would find charges of ball tampering on two occassions were harsh decissions. Certainly in Sachin's case.
Pakistan unfortunately have been found guilty of ball tampering in the past and if I am correct some of their crickets admitted to it in their auto-biograhies.
But I don't see how ball tampering has become the worst form of cheating in cricket.
I am sure you will find other cricketing sides have been gulity of cheating in one form or other in the past.