Why do you find it so hard to believe that they could have put in demolition devises in the 90's, in case of an emergency to bring them down straight instead of crashing into other buildings?
Many people at the scene said that they heard explosions.
Aside from the fact that such a process would have had at least some credible documentation and eyewitnesses, why bother? Gravity will do the work for you to bring the buildings straight down every time.
How would anyone know what they really did during the renovations after the 1st bombing?
The towers reopened 20 days after the bombing with new security measures in place, including restrictions to parking lot access and electronic identification badges for building tenants. Over the next eight years, the Port Authority spent a total of $700 million on renovations, with safety upgrades like battery-powered stairway lights and a separate emergency command center in each building. Mayor Rudolph W. Giuliani set up a high-tech emergency operations command center, dubbed “the Bunker,” at 7 World Trade Center, a 47-story office building adjoining the towers.
World Trade Center - Facts Summary - HISTORY.com
Yup ... not a lick of evidence of demo rigging in your entire post, therefore 9/11 could only have been a controlled demo!
Well it doesn't help when this stuff is on the web.
9-11 Review Nanothermite Explosives at the WTC Conclusive Evidence
That is certainly damning evidence for someone who has no idea what that actually means. Using your same reasoning ability, I had the soil from a flower bed in my back yard analyzed. Among many other things, the composition included nitrogen and oxygen. Imagine my shock when I learned that oxygen and nitrogen are what is NEEDED to make NITROGLYCERIN !!! Proof positive that that flower bed was once the site of a massive explosion which must have been caused by some secret government conspiracy. See how that works?
Which is exactly why I said it doesn't help with this stuff.