Questions About Refugees and Immigration After a Shocking Attack in Northern Ireland

When is immigration a net negative?  After a shocking attack in Northern Ireland where a refugee appeared to try and behead a citizen in the streets of Belfast, Jeff, Bill, and callers debate immigration and the positives or negatives.  In Northern Ireland 85% of their population growth is due to immigrants.  Is that a positive or negative?  See omnystudio.com/listener for privacy information.