The government dropping bombs onto US citizens is more likely than you think: https://en.m.wikipedia.org/wiki/Battle_of_Blair_Mountain

Private planes were hired to drop homemade bombs on the miners. A combination of poison gas and explosive bombs left over from World War I were dropped in several locations near the towns of Jeffery, Sharples and Blair. At least one did not explode and was recovered by the miners; it was used months later to great effect as evidence for the defense during treason and murder trials. On orders from General Billy Mitchell, Army bombers from Maryland were also used for aerial surveillance.