Do we really need bitcoin?
Depend on how you see and how you use Bitcoin.
You using it every day then its obvious that you need it.
Most of the members here will say yes but bitcoin is not needed unless you want to earn or lose your money. Bitcoin is a form of gamblmg that if you are new you can have high chances to lose money and that benefits others as it comes to them as profits right?
Every investment has risk and an investment that you invested your money on it without knowing anything and you just invested on it like throwing your money away is kinda gambling already.
Bitcoin has been created for an alternative way of paying things but most of the people here sees Bitcoin as another form of investment so we need Bitcoin to earn money

.
If I am mistaken the growth of bitcoin market is because people are buying it even at the current price which is 13k$. See picture below,
Trust.
One word that explains why people are still buying even the price is at its highest already. Many investors especially these newbies are trusting it thinking that even they will buy at its highest now, they believe that in the long run it will give profit to them.