Panda Keeper

One who puts extreme effort to maintain or improve something that should by natural process die out.

Taken from the ridiculous effort needed to keep Giant Pandas alive in captivity despite clear evidence that the creatures are Evolutionarily Unfit For Survival.

Dwight: Did you hear about Jim and Pam, they're trying to work it out despite what she did in New York.

Oscar: Yeah, Jim is such a Panda Keeper, he should have let that relationship die a long time ago.