Use bitcoin responsibly
You can't ensure security, currency and commodity without ensuring the security of your trusted bitcoin wallet. Though many still break through these securities so just be alert and be careful. Your bitcoin won't get snatched by hackers and attacks if you are carrful enough and for thatvreason. Bitcoin won't be bqnned from your country. Security can also be discussed and enhanced by the government circle.

Commodity
For people who invest and wait for the prices to go up
Currency
For people who use bitcoin to buy services and stuffs online
Security
For people who would like to keep their currency safe.. they use bitcoin

As uou can see it depends on how people use it and what point of view they see in 'bitcoin'

Introduction to bitcoin is a must. But if I were to introduce bitcoin to someone, I will persuade him to do investment in a more positive manner.I will exclude the disadvantages of bitcoin (about privacy, safety, etc.) ,except for 'bitcoin investment takes time' thing and highlight more about the different benefits and advantages. Disadvantages will be explained there after.
One must enjoy the knowledge of bitcoin experience before making them frightened of the disadvantges by doing so.

It worked for me and my relatives as they want to earn such.

BTCs are widespread to many companies around the globe.  Only the most trusted sites can give you the value of your withdrawal.  Many buy not just to hold and sell it when the time comes,  they use it to spend as a currency in certain circumstances.  And I tell you, these companies do accept cryptocurrencies. I can also use these to purchase online Coins or Gaming Money.  Which are very helpful among the online players who can actually purchase cryptocurrencies.  Well it would be dumb for them to do it,  as it will make them look uneducated but the point is there.

As you say,  yes BTCs are undeniably unpredictable.  For that reason many are afraid to hold but many stay smart and wait for the right moment where BTCs are in their highest value. Despite that fact,  we still must accept the risk and risk further as it will eventually result into success.  It is still early to say that BTCs and other cryptocurrencies will go down.  Stay alert and updated to lessen the risk of disaster for your BTCs.

One can think about his/her safety.  Cybercrimes are so popular that having BTCs can be dangerous.  Others realize this and sell their BTCs right away.  Other reasons than that are people needing urgent money or others don't need it anymore.

Well, yes it is not for now.  But,  wait a little longer where prices starts to inflate,  you won't say it is not late anymore. Buy BTCs where prices are at its best.  Buying BTCs when it is in its highest value seems kinda stupid.

That is absolutely one of the benefits of BTCs.  Emergencies,  as it states,  are unpredictable disasters. If money is urgently needed,  then waiting 2-3 days of process from banks are massive wastes of time. Cryptocurrencies are more helpful that way.  Lastly,  BTCs can give more profit than saving in banks.

Weak hearted and scared BTC owners automatically sells their BTC if they found out and see that the BTC's value will go down..  Without having further damage and loss these people tend to sell all their BTCs and avoid risks of lossing money.

I do think that some point

1. The rising and falling of values are unpredictible.  Once you make a wrong move,  it will be a great loss.
2. As it is unpredictable,  always buy BTC when it is at its Lowest Value. That way risks are lowest.
3. Always have patience, and intelligence in mind.  Keep updated to how BTC will be valued at a certain time

If banks had a comparison with cryptocurrencies,  banks are worthless.  (Well if you look at it in this point)  Banks interest per month is constant,  percentage doesn't rise or fall. It is a very boring,  low-achieving process. Cryptocurrencies (Bitcoins for example)  needs intelligence,  patience and your guts' intuition and it will produce a fruitful achievement.  So why go with banks.  With a little effort,   cryptocurrency will do more for you.

It would be a lot more safer.  Spams and phishings will be gone so that it means having a more comfortable experience and a more ensured business.  Spams and Phishings costs a lot more moneyband specially produces more stress than government Taxes.