That's because the Imams teach the fundamentals and whats concerns generality and understandable for the genreality. Complaining about secularism and making philosophical attacks and discussing daily politics as done in forums is not what they are meant to do when the masses have no fundamentals on Islam and the masses have much else to worry bout rather than discussing fine points on a subject the masses have no idea about anyway. And those who have more knowledge would strive to attend other lectures or organise events to conduct lecture on topic they think is needed or read books or join courses to obtain greater education, etc to satisfy the thirst. Cant mouth feed everyone. You need to be active your self and connect with ulema who you think have the ability to address the subject and bring them to discuss the subject.