You still don't get it. If the planes themselves were sufficient to cause enough damage for the collapse then you can't simultaneously claim it would take tons of explosives to accomplish what a single plane crash could do.
IT WASN'T THE PLANES ALONE.
Whether you want to believe it or not, weakening steel to a point of failure due to fire/heat has the same result as severing a column with explosives or thermite. The fire/heat scenario just takes longer. The heat weakens the steel to a point where the weight/stresses are greater than the steel's ability to support/resist it, thus it fails. Not to mention the fact that the actual impact of the planes REMOVED some of the perimeter columns and possibly some of the core columns altogether. After the impact, the other columns/supports/connections have to pick up the weight that is no longer supported by the removed columns. Now add in fires that weakened the columns/trusses/connections. It all adds up to structural failure.
After this argument, people want to bring up the fact that no other steel skyscaper has ever collapsed due to fire. Ok, you want to make that comparison, then we have to compare apples to apples. Show me another skyscraper of 100 floors, using a tube in tube design that the towers used, and that was struck by a plane. If you can find one that had these characteristics and stood after, then we have an argument.