These things are only traumatizing if you want them to be which is usually because your parents trained you to respond in such a way.
But if they don't have someone with especially little hands, or a tool designed to ease the process, it doesn't seem like a useful perfunction of pain.
Oh and "time" is a factor.
10 minutes vs. 2 days?
Unless US Customs makes us sign a document that permits them to "possibly" strip search any of us dirty foreigners before we board some plane to America, otherwise they should pay for a return ticket home if we refuse to have our bunghole explored.