Opening borders to desperate refugees from Syria is criticised by some as opening the doors to violent extremism and terrorist attacks.
But aid workers helping refugees in Greece say it's attitudes like that, which stigmatise refugees, that are more likely to breed extremism.
Victims of torture, rape, people with disabilities, people at risk of discrimination for their sexuality and children live at the Pikpa Camp in Lesbos. All of them fleeing their homes, and for most that's Syria.
They're about to be moved again; the Pikpa Camp is being shut down and cleared.
Volunteers partly blame Europe's new deal with Turkey -- deporting illegal migrants and resettling Syrian asylum seekers.
Islamic extremism is one of the main arguments against opening borders to Syrian refugees.
In New Zealand, the Government says it protects security by vigorously screening incoming refugees.
In the United States, Republican presidential candidate Donald Trump's proposed ban on Muslims is the extreme.
In Europe, a failure to integrate different cultures has been cited as a reason for the attacks on Paris and Brussels.
Since the deal, the main Moria detention centre has gone into lockdown. Since, more than 100 Pakistanis were declared illegal and deported to Turkey.
Moria's remaining Pakistani migrants have protested their freedom. Thousands have died trying. Sixty-six of them are in an unmarked clearing in an olive grove, most of the graves are unidentified.
One of Islamic State's strengths is targeting vulnerable, marginalised people, manipulating them into carrying out attacks.
Refugees arrive in Europe already extremely vulnerable. The EU-Turkey deal is supposed to help them. The concern from aid workers is that it could make things worse.