Anyone who speeds up just to prevent you from passing them deserves to be shot. But thats just my opinion and Im not advocating it.
It’s not as dangerous as one thinks. The car coming the other way always slows down or starts heading for the shoulder - even when they don’t need to. I’ve had oncoming cars flash their lights at me (indicating they thought my passing was dangerous) when, in fact, it was several seconds before they passed my car.
As I said earlier, there is great variance between drivers in skill.
There is greatvarian ein skill and a great variance in courtesy and common sense. Courtesy and common sense go hand-in-hand.