I think Tom is raising the real bogey for the TT and that is indemnity insurance.
No one wants to think of the repercussions if unprotected spectators were taken out even by fully fit riders.
It is only happenstance but the RD name comes up again in the rear wheel incident, which sent serious shock waves through whole TT fraternity.

We have reached the farcical situation in Australia where the free annual Greek Festival in Brisbane now has to be fenced and an entry charge made just so they can pay the public liability insurance!
Motorcycle racing is far more dangerous than Greek dancing or drinking too much Ouzo!