Paraonoia? Perhaps. In my mind, there is nothing wrong with being prepared for border crossing to increase of chance of smooth sailing. I have seen a lot of vehicles with Ontario plates everywhere in malls, grocery stores, and so on in Western New York.
So my guess is a lot of people enter and leave the border easily. But I am more interested in incidents that travelers had a hard time with the customs at either end, being refused entry, how they dealed with them, and whether they finally succeeded in crossing the border. It is beneficial to travelers, hobbyists, SPs, and so on who are thinking of border crossing. I think we always learn something valuable from bad experiences. So why not share?