Usually I wouldn't advocate such a position, but I'm pretty indifferent on Canada fighting ISIS in Iraq/Syria due to the crazy circumstances. It was idiotic to fund the 'moderate rebels' in the first place, and the west's 'Assad is an evil dictator using chemical weapons on his population' is, for the most part, false. The west should have stayed out and let our so called allies of Saudi Arabia and Turkey deal with the issue; as they are Sunni majority countries, ISIS would not be able to invoke the Quran to get as many new recruits as they currently do (where as now they can say 'the infidels are invading muslim land' and point to verses that say it is now every muslim's duty to help ISIS). If the west didn't intervene then ISIS would continue to expand until Saudi Arabia and Turkey have no choice but to deal with them. However, 'there is no use crying over spilled milk' and the question of leaving now that Canada is already involved is different from the question of joining in the first place.
It would be far better for the crazy Islamists in Saudi Arabia and the crazy ISIS Islamists to wipe each other out rather than fight Saudi Arabia's proxy war against Iran for them. Who funds ISIS? Who funded the ideology of Wahabbism over decades, which has lead to the rise of Islamist groups from Boko Haram to Al Shabab to ISIS? Who commits continual genocide against apostates and gays? Saudi Arabia. Where does Saudi Arabia get their money? Oil. Who buys a lot of that oil? The USA. Obama wants to buy Saudi oil over Canadian oil due to his immense misunderstanding of the magnitude of climate change and then have Canada waste resources fighting Saudi Arabia's ISIS problem that they created for them? The issue of displacing Saudi oil in the global market is not independent of the fight against ISIS; so leveraging our military campaign against ISIS to reduce funds that go from the US to Islamists makes perfect sense.