People conspire with work associates to advance their position over colleagues. Politicians constantly conspire to win public favour, and personal gain. Government-sponsored human radiation experiments in the USA has been exposed. The CIA MK Ultra mind control program exposed in the late 1970's is another example of a cabal of people conspiring to implement an agenda the public would not approve. Plots and actions are constantly being exposed.
Conspiracies are a fact of life.
The question is not if conspiracies exist. Were they nonexistent, there would be no such word in the dictionary. There are two views of history. One we can term the 'Accidental' view of history. This view is held by the majority.