The difference between topping off your gas tank and standing in line to withdraw your bank balance is significant.
In the first case, you're seeking to secure resources owned by someone else (up to the point of you paying at the pump), for your benefit, to which you have no greater "right" than the next guy in the line.
In the second case, you're seeking to secure resources that YOU ALREADY OWN in order to ensure that you are not deprived of them. And if the government did not intervene, you would indeed be deprived of them.
In the first case, you're seeking to secure resources owned by someone else (up to the point of you paying at the pump), for your benefit, to which you have no greater "right" than the next guy in the line.
In the second case, you're seeking to secure resources that YOU ALREADY OWN in order to ensure that you are not deprived of them. And if the government did not intervene, you would indeed be deprived of them.