how can we fight terrorism?

This can be complicated but might work .... all countries who are fight terrorism should get the information data about ther each n every citizen on a database ... i.e each country should have detail info about ther citizens from criminal record occupation to finger prints ... a machine shud be created wch take fingerprint of ppl .. wch shud be added to every important places .. so that when ever a person comes he can give his finger print n go the place he wants ... this way we can track the ppl not off record or wanted ... this system may sound too complicated but its not impossible... lik if this system was already ther we would have tracked the ppl who place bomb in pune german bakery... n hav cctv camera on other places ... now ppl or politicians will say this will be to expensive but not expensive then the lives which are lost in such incidents .... besides government can utilize the tax money thy take from us instead of eating the money from ppl via corruption and other ways....