Well in germany if you stand in the center of it you're literally 300km away from almost every single train station of the country.
Trains work for dense countries, if you live in the middle of nowhere in Northern canada or some shit you're obviously not the target
But rural areas are usually better traversed by car because buses take longer (more stops, more detours, maybe not going where you want to).
https://www.statista.com/statistics/984679/urban-and-rural-p...
Yeah, apples to oranges.
Lol. I'm one of a very small group that doesn't have such choices. When you are in the military you literally do not choose where you live. If you get posted to a remote location, you now live in a remote location. If you get posted to a "small" town of 20,000 people that doesn't have train or bus services... you better have a car. And if it is below -30c regularly, and you have to get to work even on those days when the power fails, that car better be gas and not diesel.
But:
1) Mass transport isn't necessarily public. If there's a base with one town nearby where even just 20 of the people working on that base live, that's a good reason for a private bus.
2) Don't make the perfect the enemy of the good-enough. The military is even more of an edge case than emergency vehicles, and yet nobody seriously thinks normal people should get sirens and flashing lights on their commute to get past red lights. You get to keep whatever you need to do your job, because obviously you do.