The fact that one cannot trust anyone else with holding their bitcoins (at least, in my mind, to the extent that anyone would entrust another individual to hold his/her cash) is used all the time by the opposition to BTC.
This (like most [if not all] arguments against BTC) posed by the haters is used as supposed ammunition to the detriment of BTC's legitimacy.
This is incorrect logic; it is a fallacy, and this is why: The very fact that one cannot trust another to hold his/her BTC, proves that BTC has at least the same demand among those who would use it for goods / services as does cash.
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And these same people trust banks to hold their FRN's (Federal Reserve Notes...). I get e-mails weekly about bank failures. Sure, we got the FDIC to keep things going, but that's just another level to mistrust.