It's very obvious. The top of South Tower did topple to the left but exploded completely almost immediately in midair before hitting the ground.
Yes, there were explosions in the towers. Do you know what happens to concrete under heat & pressure? It explodes. Why? Because despite appearances, concrete is full of holes, containing air. When it reaches a certain temperature(or pressure becomes too great) it fails catastrophically.
Here's that happening on small-scale;
And here(skip to about 1:18);
You obviously think you know more than the combined training and experience of
Architects and Engineers for 9/11 Truth
Me personally? No, I probably don't. But much like in the Creationism/Evolution "debate", the side I'm on has a hundred-fold more experts and educated individuals behind it. I'm just bringing up
their arguments. Much like Creationism, your side has a statistically-irrelevant, meaningless number of otherwise-educated individuals.
I'm willing to bet I could even make a variant of 'Project Steve'(a list of scientists with the name 'Steve' who endorse & support evolution in response to the lists Creationists like to use showing that there are, somehow, educated people who believe their rubbish, the joke being that the 'Steve' list is
still longer than the Creationists' one) that will grossly outnumber the crackpot-theorists on the "Architects & Engineers for 9/11 Truth".