If you want to ruin a driveway or parking lot, dump a 5 gallon bucket of diesel on it. It does a great job of dissolving the tar that binds the blacktop.

I've known of vandals doing this on purpose. The only cure is to remove the area and re-pave.

I've had plumbers tell me stupid things about plumbing, electricians about wiring, etc. (And don't get me started on the subject of veterans & cops commenting on guns!)

Just because somebody's a "professional" doesn't mean they know what they are talking about. Many have learned by rote how to do a particular job, but have no real understanding of what they are doing.