The bomb suiciders are pouring like a rain, how and where they get those who blow up children's schools, shelters, hospitals, subways, buildings, funnerals, etc?

Brainwashing!! How else? In places where there is poverty, less freedom of speech, or no identity, it is easy to give people a false cause.
The scary thing is that these people are dying for this cause! This has to mean that they think it is THE right thing to do, which is why i think it has to be taken more seriously than other forms of crime, which usually happen for a person's/people's personal material gains (eg. theft, murder etc).