I totally agree but I do get the reasoning behind it from the laws side.....should something go wrong at 70 you may have a reasonable chance of minor injuries ...if something goes wrong at 200 the carnage would be for more devastating and will probably end up including others who were innocent passers by and nothing to do with any incident...
the fault might not be entirely with the speeding motorist , depending on what the other drivers have done but the blame will be put entirely at their feet.
its a bit different down south were most of your motorways are 3 or 4 lanes wide so there might be 2 empty lanes between you and other traffic but up here its mostly dual carriageways so if your speeding past someone in the outside lane and they misjudge your approaching speed and pull out theres no where to go.....
I do have the odd mad moments and have impromptu races but ive often just gave up when the other person has started taking silly risks with dangerous manoeuvres