few are more keener than you that we should actively debate politics here

I used to be, PFR. Using you pub analogy it was good until someone started coming in and regularly shitting on the floor. I could even cope with that as the staff would regularly shovel it up, throw it out and spray disinfectant about. But some of the regulars then decided it would be fun to kick the turds about. This gave them great satisfaction but it caused a stink, covered everyone else in shit and made cleaning up a nightmare for the staff.

It could still be good if only everyone would stick to discussing politics instead of kicking the shit out of each other. Until then I think I will take my refreshment in cleaner bar!