Or because they're hobby miners, the incentives/profit are not their actual main motivators when the mine Bitcoin. They will probably continue mining at a loss, then wait until the price surges their operations back to profitability.
Plus some miners might be speculators too, including professional miners.
They can be hobby miners if they have already been in this Bitcoin mining industry long enough, get enough profit and have enough deep budget. I mean they are rich enough to mine bitcoins as their hobbies without any worry on what's happening now and next couple of months because they can spend bills from their deep pockets.
They don't mind facts are going on at the moment and near future, consider mining as hobby but eventually they get profit because after several months, market rally helps them to automatic harvest profit. Several months is only example, their waiting time for profit harvest can be different depends on different phases of market.