You do realize you get killed or they force you to do thing if you do not pay a tax right? This isn't like some good time terrorist group. They kill their own people all the time for reasons and for no reasons. I don't understand how you can think at this level. THEY ARE TERRORISTS and they are gonna take what they want. They will take your computer or kill your wife for not paying them or whatever. Plus since terrorists know about btc and all that they will know people are hiding it, so that blows your whole argument out of the water... people will gladly give up money to save their own life.
i love how media have spoonfed this info to you.
i bet you even think that Baghdad looks like a shantytown like this:
yet Baghdad actually looks like this:
The people under ISIS likely fear for their lives and have little money to worry about it getting stolen. If they wanted to they could convert it to bitcoin, however the ISIS is not killing Christians because of their money, and are generally not taking a lot of money, but are rather killing because of their religion.