We can use bitcoin to buy things. That is different from other "real money". So I think bitcoin is real money.
Yeah that is right. Some think it is not because they havent tried using it yet outside. They think it is just a money online. Like those games that you can buy premium items with your online money. And thats it for them. 
We know that bitcoin only online money (virtual money) we just treat bitcoin as like 'real money' . Because we can use bitcoin to buy something or pay something although we do it in internet, not really
I don't agree with that. Seeing bitcoin as a virtual currency is what they make us believe.
In fact bitcoin is a decentralized currency, which is not controlled by a group of 'developers' or a board and can be used to make actual purchases.
Well in a Bitcoin has an ingenious means of getting around the legal framework put in place in most countries. 99% of other countries say that citizens can't make a competitor to "x" currency, specifically physical currency. Bitcoin manages to work around that by being a digital currency, and is thus "legal" in most countries.
The other distinct advantage has that other competitors to normal currencies have is that it is decentralized, as you said, so there is no way to shut it down even if it is deemed "illegal".