You want Trudeau to send Canadian young men and women to die in the incredibly complex and violent Syrian mess (300,000 deaths at least) because Drumpf has a hissy fit one weekend? 
It is a civil war.  Who would you support? Each of the following groups is involved in the hellish war, and each has thousands of soldiers:
Syria,  ISIS, the Asala wa-al-Tanmiya, the Al-Nusra Front, the Free Syrian Army, the Harakat Ahrar ash-Sham al-Islamiyya, the Homs Legion, the Ajnad al-Sham Islamic Union, the Brigade of Islam, the Jaish al-Fatah.
Then throw in Iraq, Iran, Turkey, Saudi Arabia, Russia and the U.S, which all have their own interests.
Trudeau is very smart not to be dragged into this insane bloodbath.