Getting the necessary intelligence to stop violence is hard for any given nation, but it can be done. It has to be done, anyway.
One way of getting the necessary intelligence to stop violence would be by infiltrating the various violent groups. This of course, potentially exposes the infiltration agents hence sent to grave danger, but the intelligence hence acquired can be extremely helpful.
Another way of getting the necessary intelligence to stop violence would be by carrying out espionage from outside.
Yet another way of getting the necessary intelligence to stop violence would be by cooperating with other states that may have such intelligence in the possession. Countries with relatively weak intelligence services often cooperate with international agencies such as CIA for crucial ‘intelligence aid.’
To get more insights on how violence can be stopped, you can subscribe to one of the newsletters that deal with this particular subject. You will probably only be asked your email when signing up for such a newsletter. And you can get the necessary email at the www.ymail.com service description page. So you just go the said Ymail page and create a special Ymail.com account, which you then use to sign up for the newsletters. That is, of course, assuming that you have no other email address: which would be an oddity in this day and age.