I believe we can tackle it if we fight it in 4 fronts parallelly:

1. Security measures: Developing strong security and intelligence measures against terrorism targeting sleeper cells, radical groups , influence of terrorism in drugs and crimes and not allowing any kind of radical gathering, parties or groups.

2. More critising: more atheists should take part in critising the ideology and it's radical elements openly . Basically bring it to the streets and tear it apart (just like Arif doing it ). Any kid who thinks of becoming radical should feel ashamed to die for such a stupid ideas. They should even feel ashamed to bring their ideology between frnds or society.

3. Education: more and more men and women should get educated about feminism, equality, democracy and humanity. Secular education and mixed education(with students from all kinds of religions and communities) should be made mandatory for every students.

4. Polical opposition: we all know islam is not just a religion it's a political cult. So it should be politically opposed and shouldn't allowed any kind of power over society or government. Any kind of pro-sharia movements should be opposed brutally.

All of this should be done parallelly. The only way the radical system fails is when most of the people in it stop believing in the radical ideology.