In the chosen (maybe not so great) simile, 'A' was a simple lever to pull == then someone dies.

In 'B' (less mechanically abstract) - you had seconds to somehow 'stop the train' (maybe there was a hand-cart down the track with workers aboard? == whatever.)

Both anent Spocks's 'sacrifice of the one to save the many'
(whichever ST movie wherein Spock pulls the top off the Pure Neutronium Generator and gets blasted with 50,000 REM [or REV - for Vulcans?]: dies.) Until Genesis sequel.

ie in B: just suppose that someone had to be tossed off the overpass, as the only available means of fershure getting engineer's attention.




{sigh} too many notes words VS the audio version..

Recall? students were directed to 'shock' (other students) for (whatever manufactured infraction.) While the victims were simulating agony - the victimizers Did Not Know that ... as they nudged the VOLTAGE knob higher. Lord/Flies R'Us.

And it seems that, all the new toys - especially the multitudes of Killing Games/pix, repeated incessantly in young impressionable/bored minds - are not
{\ufffdSurprise!}
producing fewer Attilas: just more innovative wanna-bes.