The reason is very simple - profit.
The rabbits were not worth much to the Europeans, but were to the Aztecs, but the cocoa beans for the Europeans were like gold. They were a very attractive exotic product from which unique and unseen things were made. In the European market the cocoa beans had enormous price, and the demand for it was very high especially from the aristocracy which loved it and didn't speared money for it.
Because once it is denied to one person, no one is protected by the law.
-communism spread
-millions died because of conflict and starvation
-people lost their freedoms and were uneducated.
Need more ideas go search online and skim through.
England, West Indies and Southern Europe