So you admit you DON'T KNOW how they knew it was going to collapse?well 2 other huge buildings had just collapsed, raining tons of debris on WTC7 and leaving a huge gaping hole in the side of the building, i would guess that in the question 'will it collapse or not" they would want to err on the side of caution
Yes or no, wouldn't one way they would know it was going to collapse is because they were going to demo it?