"It happens a lot..."

If you lift an article from another author online and not give credit, then get confronted by the original author - you should not play the 'you should be glad that's all we did' card.

The internet crowd are very unforgiving, especially once word gets out.

[Update - They went down in flames. Their online presence has been reduced (for now) to a whimpering web page of whining and blaming. Too bad they missed the point.]