There is only one reason for a normal person to want a Bitcoin - to break rules, laws, and regulations.
You're suggesting only terrorists & criminals use bitcoin?
What a thing to say.

There are plenty of legit reasons to support and use bitcoins.
1. Economic stability. Bitcoins are more stable than currency printed by central banks.
2. Low transfer costs.
3. Independence from banks, credit cards and others who have near to a monopoly on money exchanges.
4. Protection from inflation.
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