Because those who wrote the law have cover from parliament passing the law. Who would we be cuffing? Those who drafted the law? Or maybe those who whipped party members into line to vote for the law?

In my opinion, people drafting illegal laws is to be expected. It is the responsibility of parliament and the house of lords to keep illegal laws from being enacted. So if we were to cuff anyone, it seems to me it ought to be parliament. For parliament we have a different measure than the courts though. That would be elections! It seems less that wise for the public prosecutor to be able to target members of parliament for how they voted. The solution should be sought in a better democracy.

An underlying issue here might be that a majority of voter would actually like to see the constitutional basis for this ruling changed. The Brexit vote could be seen as supporting this. If indeed the electorate wants to get rid of this, there is very little to be done. And that is how a democracy is kind of supposed to work. Sometimes, this makes democracies suck. But like Churchill said, democracy is the worst form of government except for all the other forms we've tried.