I don't think therapist find ruptures such a big deal and some sects of them even advocate them as showing something is working (I am not claiming they set out to cause them necessarily - although I do not rule it out). They may or may not care about the client personally (try to refrain from attacking me on this - they may well care for all I know - just it is irrelevant for my point) but they are detached. It may not be super pleasant to deal with a client who is angry at you, but I think it is sort of a therapy challenge thing for them - can they skillfully deal with it and bring it to a satisfactory conclusion. It is like "wahoo - I get to use what I know to resolve this and that if I can it shows I am a skilled therapist."