Oh, I see. That happens in a lot of organisations, unfortunately. Why do you feel that your thoughts on it are un-Christian? It seems to me that if you think that morally it's not right, then that's probably a very Christian way of looking at it.
Let me get this right. You are a Christian, yes? Certain guys are working beside you that you feel get too much state benefit or are overpaid (in your opinion)?
You really have to ask yourself: What is 'wrong' with them?
If you are a Christian, don't feel guilty about it. Such feelings are natural. The point is to get things into perspective.
When I said what is 'wrong' with them, I meant what is 'wrong' in your perspective. Are they foreign, for example? Or 'chavs'? These things are important.
But don't beat yourself up. It is quite natural for a Christian to have unChristian thoughts. We're only human (though we can rise above the beast, eh?).