Because BTC has huge benefits, there will be so many speculators!
Everything in the world will be like this. If there are interests, there are many speculators who risk the crime to commit speculation!
There is a false assumption that bitcoin users are dominated by criminals, whereas in reality bitcoin is controlled by speculators who move huge amounts of money to make a profit. Criminals who master the technology of using bitcoin are still few in number and for them it is better to use fiat money, because it can be used immediately.