Terrorism plays a key role in spreading communism, so I don't think you're making the point you think you are.
Discussion
Terrorism spreads everything people don't want. Communists used terrorism in many countries. Still terrorism is not communism. At that time communists were fanatics and any group that would slow down their progress was seen as ok. Remember that the Taliban in Afghanistan were the ones that kept the Soviets out. Then of course people see that communist countries are quiet. They are quiet because they torture people where you cannot hear. It's the silence of death.