When you have a problem with your US Dollar, SOMEONE is responsible.
When you have a problem with your Bitcoin, NO ONE is responsible.
...
Nice try.. but to repair your flawed comparison, it'd need to be something more like:
When you have a problem with your US Dollar *in cash*, SOMEONE NO ONE is responsible.
When you have a problem with your Bitcoin, NO ONE is responsible.
..and to both of those you could add:
... unless you choose to utilize(or establish) a trusted intermediary
And that's charitably assuming you're not conflating macro problems with USD/Bitcoin vs an individual's problems with handling the stuff (but it rather seems you are).
Bitcoin can be reasonably considered a protocol or a 'base' upon which layers of protections can be built and optionally used.
Just like the physical cash of the USD offers no direct protection and has a complex centralized electronic infrastructure which does in some circumstances offer merchant and/or consumer protections; if the Bitcoin system needs such protections to move into certain niches, then it seems likely the market will produce offerings on top of it to achieve that.
If you're talking about more macroscopic issues.. well the 'responsibility' is different for sure, but in some ways comparable.
Theoretically - you influence those who direct US Dollar policy through your vote... and theoretically with bitcoin, the network's users/miners influence the various client/library developers (and thus which is the surviving blockchain) by 'voting with their feet' so to speak.