> > But (re my earlier response) why use a transistor at all?
>
> So it's OK to short MCLR to ground with a pushbutton switch that
> was also shown on the schematic

It's recommended to have a series resistor (220R) into MCLR, and
if using a reset switch to ground MCLR through 100R. Also a cap
(eg 10n) from MCLR to ground to ensure that MCLR reaches Vcc
after the Vcc pin does ( if POR function is not used - DS00007 )

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