Does it really take a genius to figure out the much of the "terror" of the world is funded by the illegal drug trade?

Does it take a genius to figure out the much of the reason for the corruption is Mexico, Central, and South America is funded by illegal drug trade because if the market was controlled by legit companies the degree of profit would not be there, money would flow over the table instead of under it, and because companies not guerrillas would manage the industry?