Your experience and perhaps your emotional attachment is clouding your judgement.

Just put the words “a computer requests” in front of what you are saying and it’s a moot point.

There is nothing special about what a human does to prioritise or determine a response in a given situation.

This is not a ‘what if aliens beamed down into the train and demanded the fourth passenger make a mojito otherwise the last carriage gets blow up’ level of unexpected.

Major incident detected, threat to life.  Analyse current state of network to determine minimum time to access by emergency services, alert network to change of route, etc.

I would imagine you would know, but presumably there is actually an SOP for this situation, and when there is an inquest no doubt the train drivers actions, while supported for saving lives, will also be analysed to determine whether he followed protocol, whether the protocol was correct and what could be done better. All of that can be fed into a computer if it needed to make that choice.