Ofcourse we do, especially our Muslim Syrian brothers but atleast attempt to learn the language. I can tell you from experience arabs in Somalia can care less about ever learning a word of somali
Why is it a big deal to you that they learn the language?
As long as they are law abiding citizens going about their way, who cares?
I would encourage any immigrant to any country to learn the local language, as that will make life in that country a whole lot easier for them. Outside of that, it shouldn't matter.