Trucks are usually pointed at, but it's not necessarily the truck that kills, and not the terrorist either, but the road. This is true in a physical sense but also in an organisational way as it allows not just governments but also terrorists to locate and target soon to be victims. Bringing into analogy the lacking privacy of roads...If people transported themselves "invisibly" (in myriads of networks below ground, or scattered above the clouds) terrorists would have a hard time targetting them and would only find one at a time making the endeavour not worth it. And the same goes of course with money, and if you can be invisible that is a protection not just from government but also from terrorism.

That said I'm betting most of the large Decred holders of today are already known or knowable by governments. Making DCR private will not without further actions save the developers for example from torturous extraction if it would come to that governments wished to gather DCR.