In Pakistan's case a number of outside powers have funded and even armed sectarian organisations active here. Iran and Saudi Arabia are said to have fought a proxy war on Pakistani turf. In view of their recent rapprochement this is probably no longer the case. Nonetheless sectarian hatred and violence here does have non-indigenous origins. Whether an audience is receptive and responsive to hate-mongering depends on the effectiveness of the speaker, but also on the audience itself.
People are more likely to agree with a message of hate if they are angry.
Young men with no educational opportunities, no employment opportunities, living in cramped conditions, seeing no way out of the circle of despair, will naturally be frustrated and resentful. Those spreading the gospel of communal hatred feed on that frustration and resentment. Pressing population needs have been neglected in a gluttonous scramble to amass wealth. In this scramble the problem of sectarianism has also been neglected. Time and again such criminals are freed on bail, or they evade punishment with an endless series of appeals.