I don’t think they have separated deen and duniya. Most tableeghis are professionals working in corporations at good positions. They do drive cars to works and use ATM cards. TV…now we all know how getting deeply involved with watching TV can do so some of these guys have eliminated it from their lives so that there is no chance of getting distracted. It may look like an extreme measure but will you believe it that in a 24 hour time period I watch TV for maybe 20 minutes? I don’t miss it or feel the need to have it. If these folks choose not to turn it on, and can live with it, then why not.
What these people are basically doing is using their spare time towards nurturing their own deeni foundation and then spreading it on to others. If I got an opportunity to positively impact the life of even one muslim, I would accrue so many credit points towards my hisaab kitaab on the day of judgement…but how many of us actually even TRY to do that. We have become so politically correct that we hesitate to even mention to a friend who drinks that maybe he should consider quitting…or forget a friend, how many of us tell our own siblings to add one more namaz to their schedule?
So yes, the responsibility is of the entire community but if a group has been formed for that purpose, why are we getting threatened by it?
Regarding extremism, personally I don’t know even one person out of the 40 some men we know in tableegh who are “extremists.” In fact there are many other very independent wishy washy type, keep to themselves sort of folks who have probably never accomplished anything in their lives who become extremists just so they can belong to a self acclaimed class of martyrs and make a mark regardless of how negative it is.