They are "safe" because they were rescued from tyranny in 1944, and protected from tyranny for the next fifty years by the United States and its allies.

They are "safe" now, as in the sense of not being attacked by terrorists because, frankly, nobody cares what they do or say. It's the same reason the President of the United States has always needed Secret Service protection and the mayor of Berkeley does not.

As far as "ethnic cleansing" and "Third World countries" are concerned, Belgium is probably lucky that international terrorism was not feasible back when they were having such fun in Africa.