All of the anarchists and socialists and marginalized and oppressed communities are on the left. Their arguments against gun ownership and the second amendment were never based on an implicit trust in government.
Certainly not - their argument was always that it doesn't make sense to argue that we need guns to overthrow the government. Not that the government is broadly trustworthy.
tbh "we can now trust our government to not overstep its authority and people protecting themselves against tyranny was no longer needed" sounds like an intentional misrepresentation of a leftist position than something many actual leftists would believe.
The political side that that often argues for more government in their political solutions seems to by default to trust the government “to not overstep its authority”?
That's far from true and universal.