Since there is no central server it cannot be hacked easily and therefore our information is safe and secure. So one should do transaction via Etherium. Since Etherium work on smart contract where each and every transaction is recorded on computer code which is fully secure and safe and involves no paper or complicated work.
Here the storage of data's is also safe as it is decentralized and therefore information is not stored in one server but many data points and Etherium is likely going to provide solution for this.
All countries who elects their representatives via voting system (Democracy), can uses this system as this will bring more transparency in the voting system, since nobody has the complete control over the network and every change is logged and is visible to the public. Therefore, ethereum will ensure a more transparent and fair democracy.