The MI5 authors stress that the most pressing current threat is from Islamist extremist groups who justify the use of violence "in defence of Islam", but that there are also violent extremists involved in non-Islamist movements.
His behaviour was often disruptive and he used violence as a defence mechanism.
Despite the violence, Armenia's Defence Minister said this week that he believes there were "no grounds" for a "large-scale war".
In the late 1960s and 1970s, it was extreme leftist groups such as the Black Panthers and the Weathermen whose rhetoric legitimated armed violence as a defence of "the people".
If such a person, told by the drunken perpetrator that they are going to be beaten senseless when he wakes, loses her self-control and kills him in fear, anticipating that serious violence, the new defence could be claimed.
The US secretary of state, John Kerry, released a statement noting his "deep concern about the bloodshed and violence", and the defence secretary, Chuck Hagel, contacted Sisi to "express deep concern about the security situation and recent violence in Egypt, and to encourage that restraint be exercised during this difficult period", his spokesman said.
On the fourth day of the conference, activists have also been debating the situation in Syria - although they did not hold a vote - efforts to reduce cases of sexual and domestic violence and future defence policy, including Trident renewal.
Hundreds of thousands of people have been displaced by violence, and self-defence or vigilante groups have emerged in several states including Guerrero, Oaxaca and Michoacán, as communities have taken up arms in an attempt to protect themselves.
Kweli tells me, however, that the NBPP only promote violence as self-defence.
The second most reported reason by women was feeling afraid and using violence in self-defence in a violent situation.
