Most of us would have missed that piece of info.
Such is the power of Western media's mass brainwashing.
It's scary. This is worse than the guerilla warfare of Vietnam.
Actually the guerrilla warfare of Vietnam was something very good. Thanks to it Vietnamese people managed to protect their country against US genocidal terrorism.
If these Rohinyas are assimilated into the different countries under refugee status, what is going to happen in later years when the sleepers are recalled?
Like cancer cells, Islam spreads in many ways and everywhere. In this degenerate age many people, not only Rohingyas, are simply attracted to Islam's message of violence. You wrote your message just two days before the Paris attacks, which are kind of answer to you question.
Leaving religion aside, how do we deal with this horror?
Understanding its sources, and denouncing them. For instance, US and Israel have brazenly and for decades supported Wahhabite terrorism, which includes al-Qaeda and Islamic State, while trying to convince the world that they are “fighting” terrorism.
What is the Dalai Lama doing?
Just performing his role as a puppet, as ascribed to him by his puppet masters.
Does he know what's behind the scene, as they call it?
Of course he knows. He is part of the mafia behind the scene, although just as a minor puppet. That's why he is called the evil dalie.