Inflation hits the masses, or in general money supply manipulation schemes. In the last few weeks, markets tanked just because the FEDs announced they plan to increase interest rates. Is that really how we want to go on?
Bitcoin is not being manipulated. You may be confusing it with Bitcoin markets and Bitcoin trading. Nobody can conjure Bitcoin out of thin air or manipulate interest rates on it.
That's your best argument against regular currencies? That they're being manipulated, too? :-)