@Pete 2 - Police remit?
The question with the proactive solution is, is it within the Police remit?
They are meant to detect and solve crimes, they run a small (but admittedly increasing) number of crime prevention initiatives.
What we have seen is many people worrying about scope creep. Today it's ones with Olympic in the name, tomorrow it's anything that could be used to facilitate crime in the UK. Statistically a significant number of criminal domains have vowels, why not filter all of those through the police? In fact, lets make a register of people permitted to ask for a domain name! Bad guys that do manage to get on there somehow can be struck off, most of them will be prevented in the first place.
Also just imagine if the police had bought up a pile of domains and one of them happened to be one that your business legitimately needed. How many people would scream about police interference in their legitimate business if they had to go through additional paperwork? Would they be asking for compensation for the time it took to go through the extra hoops? Would there be extra bad publicity when somebody used the 10,001 domain name on the list?
Finally don't forget there's the cost of a workshop to come up with the idea, a bunch of admin to get the idea approved, the committee that comes up with the list, yada yada yada.
While an ounce of prevention is better than a pound of cure it relies on being able to trust the people administering the prevention. The police currently do not have that level of trust (and this from a law abiding person who hasn't even had a speeding ticket)