As PIC I am ultimately responsible for the safety of the aircraft and the flight.
No question about that.
Finance is a secondary consideration.
Secondary to safety by all means, but in no way unimportant. It also needs to be part of the equation, even for a private pilot.
If it is unsafe to taxi I would bring the aircraft to rest.
Certainly, but not in the middle of the runway where it would be highly detrimental to the safety of every other user of the airport (suppose for example that the jet on the approach behind you declares an emergency).
A windscreen that I couldn't see through would be unsafe.
There are still a number of ways to vacate an active runway. Not too hard to jump out and push a light aircraft out of the way, is it? Particularly if you've advised ATC of your difficulties, as you can expect a number of enthusiastic firefighters to be present to give you the required motive power, plus a quick blast from the firehose will get rid of any obstruction on the windscreen (along with the windscreen itself, but financial considerations are secondary, no?
)
I guess what I'm trying to say is, a good pilot is one who keeps the big picture in mind at all times and considers not only his own safety but that of his fellow aviators as well. And if on top of that you can also maintain straight and level then you're an ace in my eyes
