Terrorism is now happening in many countries around the world, especially those with multi-party regimes. Just as you say terrorism causes injury to people. A series of bloody gunshots. Vietnam is the least terrorist country because it is the only Communist Party of Vietnam.
In that case, there should be no incidents of terrorism in Syria. The only legal and recognized political party there is the Syrian Ba'ath party. But it is not true. Half of the country is under the control of the ISIS, and a large section is also under the control of Al Nusra.