And if we're being really honest, the government probably doesn't mind the alien conspiracy theories at all because by having a fake reason to hate the government you're distracted from the real reasons to hate them. People that focus on the fact that the government might be withholding information about aliens from them have a higher chance of forgetting about the government withholding things like healthcare, food security, student debt relief, public transportation, consumer rights, survivable minimum wages, etc etc.