Such debate is ongoing since many centuries. So the Psycho-religious theory tells that human dogmas and doctrines once established over time don’t easily surrender to rationality, enlightening or superior reasoning. Such differences are generally irreconcilable if confronted with hard core Moulvi. Since each sets of believers have their own perspective and narratives that influence and urge to defend their unique belief. If that is true then the idea that Tahirul Qadri and Allama Parvez should share the same podium seems flawed.
This was once explained by Dr. Israr Ahmad. In his gist; if we see a house from the front, back, sides or from a helicopter the same house will look different. Different perspective from different sides. Nevertheless he said, we need to have a holistic view of what we need to see as true.