When the system is faulty (capitalism, fascism, socialism, communism etc) there is no way the leader can be trust-able, that also means corrupted leader are the ones that will use his power in the government to institute whatever he want
Yeah, and the fact is the system has been faulty for a very long time, monopoly and corruption has been the norm of the day at the detriment of the masses and for that fact, why would anyone ever want to trust anything that comes out from the mouth or action of goddamn corrupt politicians that only think about all the funds they want to keep looting. Good thing they are losing the power we gave to them and that makes it even more interesting.
because of the incognito, it's hard for the government to control the using of bitcoin, crime can use bitcoin for money laundering,...
You should not forget the crimes you are mentioning are not the innovations due to the introduction of bitcoins hence governments never need to bother about the evolution of bitcoins and other cryptocurrencies.