Pompey,
Tks - I do actually agree with you as to what should happen. The trouble is it so often doesn't. There were two more examples at the weekend - the 3rd Sheffield Weds goal against QPR and the Arsenal penalty against Reading - although the Reading situation was really strange as i don't think there was a 'covering' player or a card of any colour produced.
Unfortunately the 'last man' argument raised by others here, although relevant, doesn't affect the inconsistency of the decisions given. So often the 'covering' players are the 'last' man, but their chance of getting to the ball before the tripped player are pretty remote. Kev was a covering player on the goalline on Saturday - altho' he had slipped over.
Clark was unlucky - I think there was contact but it didn't look intentional - the Gillingham player - being charitable - slipped 'similarly' to Kev & the referee made the decision. If he had been in any way competent in the remainder of the game, I guess that this decision would have been in some ways accepted. The real trouble was that he could not even attain the level of 'poor' as others have pointed out.