Yes, it is amazing. Happens in politics all the time and people don't care - not till they look at barb wire from the wrong side, anyway.
Maybe they do care once their income drops to zero.
Last time I checked Ghash doesn't actually take a fee so I wouldn't say they don't care, it's more of the fact they don't care enough for them to skip that extra 2% or whatever other pools charge them. It is rather surprising that they don't see it as potentially a threat that could make their hardware useless (as far as earning money goes) but probably they're thinking that everyone else will switch and they can continue to mine feeless.
That is the plain example of prisoner's dilemma. People always think they are smarter than the next guy; and won't cooperate even though when they don't - they are all screwed.
tl;dr; people are stupid. people still mining at ghash deserve to have their hardware worth zero. too bad they will take the rest of us with them

and make a monument to human selfishness and stupidity out of the great project that is bitcoin
