Shall we welcome all refugees?

The war in Syria cause that many people go out of their countries. The refugees request our aid, but shall we welcome all refugees?

I don't know, because for a hand, to us also aid us when we were in war. Too we have to have solidarity. But rigth now I see humans, but not humanity.

On the other hand, many refugees can be a terrorists. As well many people can come and we wouldn't have sapce or foods.

For this, I don't know what to think.