Let's be fair, the US has installed and supported plenty of dictators in Europe. In Greece, Spain and Romania at least the US has strongly supported the dictators there.
You don't need to install dictators. You can just continue to get potentially problematic leaders into unexpected accidents until your guy gets voted into power.
That sounds like a conspiracy theory. It was more like the U.S didn't support democracy in certain European countries(i.e left them to Russia) than to support dictators backed by communist systems.