I can't see the video, but I'm assuming it's noting the disturbing link between a lack of belief in God and violence.
If so, it's not wrong; Atheists have a history of death and destruction that far exceeds what would be expected given their relatively small population.
Is it really surprising that a worldview which inherently devalues human life and rejects objective morality has such a bloody track record? It shouldn't be.
Tim McVeigh was a self-confessed agnostic, which would make him (weak) atheist according to many.
McVeigh Faces Day of Reckoning | The Guardian
In his letter, McVeigh said he was an agnostic but that he would "improvise, adapt and overcome", if it turned out there was an afterlife.