Some people don't see Bitcoin as a normal currency and think it's too risky because its value can change a lot.
It is normal for some people not to see Bitcoin as a normal currency because BTC was indeed not a normal currency for it is a futuristic currency and they will always hate it due to its volatility in price because they never understand the benefit.
They also worry that it's used by criminals for illegal activities like money laundering.
There's no currency in the world that's not used by criminals to carry out their criminal activities. Besides, a video surfaced yesterday on Skynews where some couriers service agent was arrested for laundering fiat currency for the drug lord.