they view it as you are not in control of the vehicle, therefore it is dangerous. If rear wheels are spinning you don't have as much steering control to steer out of the way of that kid on a icycle or something. Not that I don't burn out in my Z everynow and then, did a nice 2nd gear bark yesterday going under an underpass. Gotta love a GReddy PE under a 8 lane highway bridge at redline! LOL :)