Earlier quoted context omitted.
The consumer electronics industry has shipped hundreds of millions of touch screens in the last few years and i've not seen a single article complaining that they opened up their new tablet/phone to find it mis-calibrated and that their touches were off my such a huge margin. Why are voting machines apparently subject to calibration problems that other touch screen devices are not?
I have owned a ton of touch screen devices. None of them were miscalibrated, even after years of use. I have used a ton of touch screen devices in public. I've encountered quite a few that were miscalibrated. Public devices put up with abuse that your private devices do not.
My kids abuse my iPad pretty heavily but generally smacking on the screen with their hands and fingers a lot but I still have never seen it mis-calculate a touch.