Did someone knew that Disney+ changed the trailer for Doctor Who in ther platform? They replaced the David Bowie song for something more sombre. Also, in the scene with the Doctor screaming in space from inside the Tardis now you can see that Mel is behind him and the inside of the Tardis has been replace by the memory Tardis from Tales of the Tardis.
I feel The Doctor still wanting to help them comes from the point of view that you should never lower yourself to the level of your aggressor. Or, as Michelle Obama once put it - when they go low, we go high. Basically means you need to find the solution from a place of love not anger, but feel angry and hurt, just don't allow it to eat you up to a place where there is no solution to be found.