The logic seems to be "if it's not going to start on time anyway then my being late shouldn't affect anything". That seems reasonable to me, or at the very leas

The logic seems to be "if it's not going to start on time anyway then my being late shouldn't affect anything". That seems reasonable to me, or at the very least, if a doctor's office is chronically quite behind anyway, then your being late is only contributing to the problem, not causing it.