Tires: tires rotated wrong, Directional Tires

Question
I had tires rotated and heard a thumping noise.  Long story - the directional tires were rotated with the arrow wrong and driven 1000 miles. When fixed, the thumping continues.  Some say this has ruined tires; dealer says it would only have affected handling during the time they were wrong.  What is the truth???

Answer
Cinda,

The real problem here is irregular wear which is caused by misalignment and aggravated by insufficient inflation pressure and insufficient rotation practices.

Directional tires do not wear funny just because they are rotated in the wrong direction.  The only problem would be that they will not have as much wet traction as they could have.