They are also infiltrating our nation with intent to do harm. The "occasional" meme is only valid until those here start wreaking havoc. Back to the "fight them there or fight them here" adage until we actually secure our borders and then there are a number working on long-range nukes - if we sit back and wait, the result can be devastating.
Obama meddled many places he shouldn't have and helped them build in strength and resolve - in so far as what he did, you are 100% correct - but the upshot is that he helped create a condition that will require us to make some very hard decisions if we are to actually protect the People.
We should keep them out of here.
That we can do pretty effectively ... if we have the will to do so. The problem is going to be working with governments like Canada who are lax on who they allow in.