So this thief of yours can take a glass, extract a print, and make a fake thumb and then lift your phone, but they can't notice your pin and then steal your phone? Uh huh.
With some people, you can tell their pin or swipe code just from looking at the screen and noticing the print smudges, especially if they just check an email or something like that. Might be enough just to take the phone.
Also, just because you use TouchID doesn't mean you have to use Apple's payment system. I just use it as a really convenient way to unlock my device and that's it.
It seems as though you want to argue against fingerprint readers so rather than logically consider the likelihood of a scenario occurring (petty criminal swiping a phone and having the ability to clone a finger print) you've picked a scenario that you feel best suites your conclusion and dismiss others that are more practical or likely.
If someone is stealing a phone and attacking the fingerprint lock, they're less likely to be a thief and far more likely to work for some government agency, in which case: