My deepest sympathy.
I think the attitude shown by the staff looking after your father is caused by the fact that many people would rather be given false hope than be told outright that they are dying.
If your father had made it clear to them that he knew he was dying and had come to terms with it, the staff were very wrong to jolly him along, but if he or you had not made it clear that you both knew what the prognosis was, then you shouldn't really blame them.
My sister found it very hard to forgive the oncologist who told her bluntly, before she asked for a prognosis, that she would be lucky to live another two years. She lived less than one year from that day, and I cannot help but wonder whether she could have enjoyed that time more, or even lived a little longer if the oncologist hadn't been so forthright.