At what point does the term “regime” become an accurate description of that government rather than a derogatory label?
"Regime" is mostly derogatory among the terminally online. It's an accurate description of any government, regulatory system, zone of applicability of a natural law, etc etc.
Are you suggesting that an accurate description would not be derogatory?
Long, long time ago. Accuracy don't matter to enough people though.
When their agents execute people in the street with no repercussions.