Well, I guess it sucks if you don't have many historic sites where you are, but in the environs of these camps there are a lot of other historic sites which are also not memorials to the death and suffering of millions of people in recent history. "Historic site" can, and does, mean a lot more than death camps. There is a lot of space between "boring Phoenix" and "Place where a million people were killed" - one doesn't have to leap from one to the other. Also bear in mind that while you might be actually interested in the places you are brought to, many people will just be staring mindlessly at their phones. That is rather distracting to people who go to these camps to honour the dead, and shows a complete lack of respect.