People fear Bitcoin because it's a threat to centralized control—governments and banks hate losing power. Plus, scams taint it, regs loom like a guillotine, and it's "too complex" for fiat addicts who trust printed money.
Beginners get hooked by sky-high gains (hello, 100x stories), inflation fears making it a hedge, and dead-simple apps/ETFs letting them dip in without tech headaches. Curiosity kills the fiat cat.