When the left advocates for importing numerous amounts of refugees, I see a major cause for as to why they advocate for it and others don't.
Besides the fact that many of these people aren't actual refugees... Let's assume they are for a second.
Most "refugees" are young, fit, and healthy men. By chosing to migrate, they are betraying their honor as treason to their nation. Rather than joining the Syrian army or assisting in the war any way they can to support their country, they chose to escape the conflict.
A liberal will not view this as a problem, because they don't hold nationalism to the same extent as others - especially on the right.
From a more nationalist and conservative perspective, these people have a nation to defend. If they are capable of assisting in some way, they should do so. It's an insult to their honor and nation to abandon it and their countrymen in times of conflict.
Though onto a broader and more philosophical subject, should this be the case? Should young and fit people capable of serving the nation in the army, or some other way, do so in times of conflict? Is it a selfish pursuit to escape their home to simply get away from war?