One other thing that makes dictatorships inferior and democracy preferable over all other systems of governance is transition of power. In democracies, it's encoded in the system in such a way that everyone seeking power wants to play ball. In dictatorship, if someone wants the power, they usually take it by force, leaving a lot of bodies behind - and the very threat of that is already a force making dictators increasingly paranoid.
That said, I think every western country could use a temporary (say, 6 months) switch to dictatorship, because I worry we won't deal with this effectively otherwise. I have no idea how to ensure such a dictatorship would be temporary, though.
What we "need" isn't important. Coordinated, responsible leadership sounds great, but that's up to the voters to decide. If the voters don't want that, then why should it be forced on them? Who are you to tell the voters otherwise?
The people elected Trump, so why not give him a dictatorship for 6 months? After all, it's within the President's power to declare martial law for times of emergency. It's the job of the voters to make sure they don't elect someone who can't be trusted with the awesome power available to that position. The same goes for any democratic country.
The powers of the Executive, Legislative and Judiciary exist to balance one another out especially in times of crises when some dictator could come along and declare himself ruler.
The people didn't vote for a Dictator, they voted for a President with very limited constitutional powers.
That said, I think every western country could use a temporary (say, 6 months) switch to dictatorship, because I worry we won't deal with this effectively otherwise. I have no idea how to ensure such a dictatorship would be temporary, though.