Clearly Archbishops Duka and Zvolensky do not believe in cultural suicide.
Good for them.
These Archbishops are clearly serving their "sheep" who do not want these refugees in their nations.
The "stranger" which Jesus referred to in the Gospel was not a suicide bomber, a cultural Jihadist, or a person unwilling to assimilate into your culture.
Additionally, there is no way to adequately vet these refugees.  
To whom do we go to get background information on these refugees?  
The Muslim Brotherhood?  
ISIS?  
The Syrian government?