Bitcoin is only one coin which we have trust and it is easy way to earning.
The reasom why we really need Bitcoin is because we need another source of income. We all know that bitcoin is a great coin, it can give us a huge profit in the near future.
After all, times have changed. Human needs and desires are growing. Life demands for greater effectiveness. So the weakness of the previous system became the initiator of the birth of a new system that is more profitable, one of which is the decentralization system that carried bitcoin. We need change, to live a better life.