Bitcoin has power because its benefits and functionality are recognized by various parties and countries, safe and fast is one of the advantages bitcoin, at this time people need security and speed in the transaction, that's why bitcoin is needed today
In one sentence you are contradicting your statements that bitcoin is safe and fast and then you are telling that it needs security and speed while transacting.Those are not the reasons why bitcoin is needed today,it gives more power to the people using it without a doubt as you could control your asset with ease.