According to media reports, bitcoin is used in ransom payment. There is not much report of bitcoin legal usage in online purchase.

If we can use bitcoin in real life, most of people will use it. For example, when I buy t-shirt or something else I may also pay with Bitcoin.

To be honest, no one would want this to happen. There are actually services which allows offchain payments and it would let a third party to gain control over your coins. It would defeat the purpose of Bitcoin which is to provide anonymity and not let a third party to control your coins. They are designed to allow customers to chargeback if needed and Bitcoin by nature doesn't allow that.

actually it's pretty simple if you think about it, they need to buy it first, they cannot acquire it directly, if wages had been payed directly in bitcoin, i'm sure right now adoption would have been in course already

right now people need to do a logest way to use bitcoin instead of fiat, because of one more step, buying bitcoin...

Maybe they want to use bitcoin but to get/earn it is hard.
For example buying in exchange they require lots of personal information and lots of verifications.
And i think that they are a bit afraid to submit government documents through these websites.

True lack of trust stops people from using bitcoin.
There are tons of news about hacks, illegal usage of bitcoin so it affects people.

i can see the subject of this thread is a question about what is stopping people from using bitcoin ...
my answer is NOTHING at all ,but the whole thread arises a question in my mind at same time :

why someone may use a diferent curency for ?
i recall in my country Greece around 80's when someone had a medical problem or urgent need to spend money abroad ,
there was a need to find US$ or some other hard currency instead of Drachmas ,so even black-market was alive for that NEED

conclusion > the real question is : what kind of goods,services or whatever we NEED and if something of all that is offered
for bitcoins then its positive to say : " I NEED TO BUY BITCOINS "

offering unique goods or services only for bitcoins can be the way to make Bitcoin better.

For my country, the exchange only require the back and front of my identity card. It differs from country to country though. If you use an ATM, the process will be much more straightforward and fast. Identity theft is a problem hence, the exchanges need to build trust or have a exchange with excellent security.

I can only speak for the ATM @ Toronto, and that didn't require any ID verification.

My guess is that most of them exchange without ID-Check.

Well good at least that you have one near you
I understand the point but at least they a camera there.
So if they want to check something they have the "real ID" in front of them in 3D