It's not for a man to accept a presumption of guilt -- even from a lawman in such times as this. That is no man should well-tolerate with a welcoming face and words and nor any thankfulness being stopped on account of driving a white van. In dealing with stupidity and a chinese-fire-drill on the part of police, however, it never pays to get overly rankled or in any way threaten them in the performance of their duties. However a man should make clear that he doesn't appreciate being stopped, and holds such a stop to be an unnecessary abridgement of his freedom -- fundamentally and in this particular case because it is such a poor way to react and a burden in expense and misdirection to us all. However, man to man -- man to the officer(s) making such a stop, a man explains that he understands why the officer is doing it, as his duty, yet one the man being stopped takes polite and considered exception with.