The reason the hash rate increases like that is because of moors law, which is constant and exponential
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Precisely, and I don't understand the constant part.
Why would it be constant?
There need to be people/entities whom will buy and install miner hardware regardless of the current price.
So therefore my question.
Do the miners know something the rest don't know?
Why would they mine bitcoin if the price is decreasing?
Miners are a magnanimous lot that they don't mind paying for the expenses to make it possible for people who don't/can't/won't mine to be able to acquire Bitcoins for fiat. Miners are what keeps Bitcoin going, without miners, there'd be no Bitcoin. Respect the miners.