in my opinion that is the biggest thing what makes people not starting using bitcoins, but it also attracts more traders to bitcoin so i guess that doesnt make too much negative impact

also governments sometimes stop people from using their bitcoins to be honest because people are sometimes not allowed to use their bitcoins as they might be punished with prison

I don't trust the government. In most cases, I hate the government. However, I do trust them slightly more than some stranger (like Mark Karpeles), halfway around the world, holding my personal information (even drivers license, credit card or debit card info), running a business that may or may not be around tomorrow.

Very true; assume that if you don't hold the private keys to unspent outputs, they're not yours. I wouldn't give debit or credit card info anyway, but these things are all a question of due diligence.

Those who are better at it, just as with every day life, get more out of bitcoin

Those who aren't... buy cloud hashes...

To be quite frank, I've thought about this, and the volatility only really precludes those who would buy it as a speculative investment or inflationary hedge. Others who might buy it are the hobbyists (like stamp-collectors and, to a large extent, me).

Volatility and green lights are no barriers to the ordinary masses investing in bitcoin if only there were proper, tangible uses for the thing. I've been walking around the streets looking at merchants thinking "why don't you accept BTC". Especially the irksome ones who don't even accept VISA, either because they are tax evading or just plain dumb. But at essentially 6p per transaction where VISA only require about 2-3p, and even then merchants throw on all sorts of punitive measures like "50p extra charge; minimum £10,000,000... spend; etc", bitcoin just does not look feasible, sadly. Fees need to decrease; wait for Segwite; wait for off-chain solutions. And reduce the number of miners and things might improve. People have to be disincentivised to mine. But that may well come in 10 days' time.

I think many people are disappointed with the increase in the price of bitcoin. Well, when they lose, they started selling bitcoin they have and begin to stop using bitcoin, but I guess when the bitcoin prices go up, they will start using bitcoin again

What is letting people not using the bitcoin is the bad name, a lot of media has really given the bitcoin a bad name.
People are thinking its only used by criminals...

Ease of use : bitcoin is really much easier to use than other currencies, because you do not have to worry about reverse of your transactions. More over it is an advantage of bitcoins over fiats for online usage.

Lack of secure hard wallets : Hmmm don't know, but surely online wallets and desktop wallets are much more secured with your encryption.

only for fear hacked I think it's not a good reason to get out of bitcoin even your bank account could have been mapped out by thieves or hackers right ? so I think you can solve this problem without the need to exit from bitcoin right?
You can add security to your wallet

"Madness" you say mentioning the government. Well, by my kind apologies just pointing out (you are from UK, right?) not all Govs are like that, like yours