I suggest you move onto the other chapter, which is entitled 'alRukhsah fi I'tizal Aimmatil Fitnah fil Masajid'. 'Chapter on Avoiding Imams of Tribulation in the Masajid.' On page sixteen, at the bottom paragraph and onwards. He even mentions Ulama who missed prayer in Masjid Haram in Makkah because of tribulation. Now even Shaykh Abdul Ghani's fatwa on congregation is that of obligation, but if the conditions are not met then that obligation is dropped. In times of tribulation, where the Imams are corrupt, the leeway for people to leave praying behind transgressors is there. But a very important point to note in the application of this verdict is that a person who notices the Imams tajwid is not good or the Imam does not pray according to the sunnah is more learned than that Imam in the prayer. Such a person is the one who will avoid praying behind someone who will invalidate his prayer. But this equally applies for other social meetings and gatherings. I do not think there is a 'faqih' who claims isolation, has tea and biscuits with people, and then misses congregational prayers that are valid. It would be appreciated if a fatwa from a living Mufti were placed on line. BarakAllahu feek.