Who let in these refugees? Why?

Farhad Jabour, an Iranian "refugee", killed police accountant Curtis Cheng while shouting "Allah is the greatest". Man Monis, an Iranian “refugee” and Islamist, staged the deadly Lindt cafe siege while professing support for the Islamic State.. Numan Haider, an Afghan “refugee” and IS recruit, stabbed two police in Melbourne. Mohammad Ali Baryalei, an Afghan “refugee”, became a recruiter and fighter for IS. Saney Edow Aweys, a Somalian “refugee”, plotted to attack the Holsworthy Army base. Now the ABC interviews another refugee, this one from Afghanistan:

The 19-year-old, who knew Parramatta police HQ killer Farhad Jabar, has been a member of a small group of young Islamic State supporters in western Sydney under the scopes of anti-terrorist officers. “Everyone wants to die for Allah, we all want to live the best life in the hereafter and want to make it to the top of the seven levels of jannah (paradise),” Hamza told the ABC last night... In the ABC’s 7.30 program last night, it was also revealed he is close friends with Raban Alou whom police allege gave the gun to teen killer Jabar and who is charged with helping commission the shooting murder of NSW police accountant Curtis Cheng. Hamza also knew Jabar and the pair studied the Koran together at the mosque, the program revealed... Hamza says while he supports radical Islam, he does not want to cause harm in Australia. When asked if he supported Islamic State, he replied: “I’m not going to answer that, because if I say yes, I’ll get in trouble, and if I say no, I’ll be a liar. I accept some of their opinions and I disagree with other opinions.” Hamza supports beheadings in Syria and Iraq and believes strict sharia law should be implemented across the world. “What’s happening overseas? Sharia is expanding: people that steal get their hand chopped off; people that kill, they need four witnesses and they die; people that smoke drugs, there’s no cigarette, there’s no alcohol, there’s no brothels.”

This Western Sydney teenager came to Australia as a 10-year-old Afghan refugee and soon after, his brothers became involved in crime gangs. One brother is serving 24 years in Australia's highest-security jail, the SuperMax, for a brutal gang murder.