Why not shoot the driver and take control of the train?

The ad absurdum of this situation would be DB escalating it into a full on hijacking scenario where they run the train in a loop, forever claiming the train cannot ever stop.

In that situation - you do what is necessary to stop the train, because nobody else will, which might involve killing the driver.

The reason you don't jump straight to shooting the driver is that doesn't achieve your goals. There is a long list of things to do before needing to kill anyone, so do those first.

	▲	saagarjha 6 hours ago \| parent [-]
		Ok, I think I understand your viewpoint better. You will do the minimum necessary to make the outcome you want happen, regardless of what it might be. The goal you want and the actions needed to make it come about need not be proportional.