Any military intervention would entail a confrontation not only with the Syrian military (supported by Russia and China), but also with Shia Iran and its Lebanese proxy, Hezbollah. Moreover, no one can guarantee that intervention would not quickly lead to another war with Israel.
任何军事干预都将不但面对叙利亚军队（有俄罗斯和中国支持），还将面对伊朗什叶派及其代理人黎巴嫩真主党。此外，没人能保证干预不会立刻导致另一场与以色列的战争。作为和不作为的危险都很高。