Since all human governments, like all human individuals, are subject to temptation, especially the temptation to use this God-given role for their own ends, there must be clear and wise critique, and holding to account.
All human governments are intended by God to do justice and mercy - to look after, in particular, the needs of the poor and disadvantaged.
God will himself one day hold all humans, and all human governments, to account, but the church has the responsibility in the present to speak words of truth and judgment in advance of that final holding-to-account.