There's never 100% safety and we have to choose between freedom with dangers or a police state.
Germany had 528 attacks on refugees in 2015 and their homes and we had the NSU (national socialist underground) which killed 11 people over years and it's a national scandal because the security service knew about them and didn't stop the group, no they had undercover agents in the wider circles of the group and gave them money.
When the group died the files about them disappeared/got shreddered. Our police always acts against leftist groups and burning luxury cars or the riots on the 1st of may but is blind on the right eye and doesn't give a shit about a dead arab or people rioting in Heidenau (german city) for 2 whole days in front of a refugee camp.
All of this is terror too, self brewed and accepted because it only targets foreigners.
We have problems with albanian family gangs and turkish assholes but just as much as with neo nazis and other german assholes.
I am 100% pro asyl and even I know that there'll some assholes on the way to Germany. They're still just people and to quote Slipknot "PEOPLE=SHIT" - everywhere, there are no better people or worse just by the place they were born. and just because I got lucky and was born in Germany I am not allowed to keep others out and accept their shitty life. We have one single planet and one mankind. We should at least try to make it as good as possible for everyone.