They are politicians, bankers, and state governments. They do want to drop bitcoin because they are afraid that their country's currency will no longer be used and replaced by cryptocurrencies. We should not be affected by their words and tweets.
Except the banks could print unlimited money and sell at a loss

or obtain all the supply for free pretty much like they do with everyone's work, goods, services and limited time with their unlimited $lavery supply

Or just buy a shit load of asics and control dat network.
The best play they could actually make right now, is Hijacking the price to the moon, so the average person can not obtain like they can, What they are doing is scare tatics and trying to get the supply through devaluation from weak hands, also a pretty solid tactic.
The thing is they need the right balance, they need average people to have some of the supply, otherwise people will not use it.