to leave or stay??

Working at the Farber is sometimes the best experience in the world and at others it's the worst. I am sure that's how most people feel about their jobs but I feel like it's a little different in my situation.
I had worked at the farber for 2 and a half years before John was diagnosed. I liked my job, I liked the people that I worked with, I thought that I was contributing to the common good and mission of the place.
It's amazing how much your outlook can change. Two and a half years later I love the people I work with, I still enjoy my job, but I have absolutely no faith in the mission. If you stop believing in a place, and its mission, and its people's abilities to do what they claim to be best in the world at then what is left?
Yesterday I was in the elevator and there was an elderly couple in there with me. They had obviously just found out some bad n ews- he was terminal and I know that look of just finding out. Shock and complete bewilderment. The wife said-"I can't believe we only got to have 30 years together." All I could think to myself what do you mean only--- you got 29 years more than I got!! You have no freaking right to complain!!!!
Should this signal the end of my career at the farber??? Have I lost that complete touch with reality and with sympathy and compassion that is needed to work there?