No and No. No individual state actor, including the United States has the right to choose what regimes rule over which people. This is the concept of national sovereignty, that each group of people who form their own nation have the right to decide what government they want to rule over them, and if it is a despotic one, they have that right.
The US Constitution's right to overthrow the government, as outlined in the Declaration of Independence, serves as a safeguard against tyranny and oppression. It allows citizens to resist a government that violates their rights and to establish a new government that better represents their interests. This right reflects the principle of popular sovereignty and the belief that government should derive its power from the consent of the governed.
Sedition.. :) :)
The US policy against dictatorships has not been consistent. The US has supported dictatorships and it has overthrown them. Generally, when the US opposes dictatorships it generally opposes them on one of three grounds:The system of rule is non-democratic and, therefore, unfair to its citizens.The dictatorship blatantly disregards human rights.The dictatorship has embraced some political ideology such as Communism or Islamism that US opposes.If you have a specific case in mind, please resubmit the question clarifying what that case is.
The US wasn't....
Well, whenever a communist state was trying to gain power, or rebels who were communist tried to free themselves from dictatorships, the US either sent troops to stop them, or by funding right-wing dictatorships who killed the people themselves (ex. Guatemala, El Salvador, Argentina, Venezuela, Austria, Germany, Paraguay, and others.)
People have the right to overthrow their government if it fails to protect their rights and property.
The role of the US as always - one of interference in the internal matters of countries, supporting right wing dictatorships, invasion of countries when it suited them. Providing "aid" with strings attached.
The US attempt to overthrow monarchy Mazarin did ultimately fail because he was very popular with the people and had a well organized army.
It was fought by democracies such as the UK, US and France against the aggressive dictatorships in Germany, Italy and Japan, although the Allies also included some notable dictatorships such as the USSR and China.
The Bay of Pigs invasion of Cuba under US president Kennedy attempted to overthrow Castro.
Because the U.S. felt as one of the most powerful countries in the world, they had to help other countries and help other people who's government doesn't stand for freedom as much as they should.
No. No official responsibility.