The FDIC insures deposits on member banks up to $250,000. So basically, as long as the US government is still around, your money is safe.
Bitcoin, on the other hand, introduces all kinds of new ways to wipe your balance out in ways that you never even expected were possible before! Hardware failures, hacks, social engineering, natural disasters, fires, physical thefts. And in none of those cases are your balances insured by the single most powerful entity in the world. They're not insured by anyone. When they're gone... they're gone!
But what do they call that in bitcoinland...? Oh right, "a valuable lesson learned about computer security."
Your money is safe as long as it's not more than $250,000 or as long as the government itself is solvent (see Cyprus) or as long as they don't introduce the idea of negative interest on high deposit (you need to move your money elsewhere or you'll be losing it) or ridiculous taxes on interests etc.
But yes, I do enjoy the fact that fiat in my bank are somewhat insured (even if it comes at cost). I also do enjoy the fact that I can withdraw some cash and carry it in my pocket completely uninsured, that I can move my funds to a less secured place, that I can convert it to gold and keep it under my bed if I ever wanted to.
Same as I enjoy being able to use bitcoin as an alternative currency, whether I choose to keep it in my control (with associated risk) or deposit with 3-rd party (even with some sort of insurance, such as Circle). And if I ever feel uncomfortable - I don't have to use it at all, as it's completely voluntary.
It's good to have various options in life to choose from. No?
ps. Still don't know how was that relevant to my post, but...oh well.