Thanks for your story
I was a teenager during that timefram (born in), I don't remember our hall having a "countdown sign", but the pressure was on and 75 was on everyones minds and lips.
certainly did a lot of damage. My family left in 81, but they got sucked back in a few years later. parents and one sister still in.
I think their reasoning is that if they deny it and rewrite history the majority of new members will not believe that they behaved that way. it's sickening