Officially, no, but it is an emergent property of their other responsibilities.

For instance, a government cannot maintain law and order without power, and a society without law and order is the definition of a failed state ([edit] well, more specifically one in which the government has lost its monopoly on violence). It's not an unreasonable interpretation to therefore say any non-failed state must retain power.

Bank bailouts in 2008 justified? Save the rich, screw the poor and the middle class. At least the society is peaceful.

Mmm not to me no, I believe in a capitalist system that lets losers lose. However the argument was ordinary folks would pay.

It is, sort off, the inherent goal of a (nation-)state. At least, that is a common and rather accurate historical and geopolitical model.

maybe it's not the job, but it's the nature of governments