Steel beams do not just implode/flatten without an explosive. Some or all of the beams should have been left partially or fully standing if no explosives had been used. Do you know how strong structural steel is? Hint: Read the first and second sentence in this post.
Structural steel is slightly stronger than it needs to be, to carry the expected load with a safety margin.
When one support piling collapses, it’s load is transferred to its neighbors. They are then overloaded and collapse, and so on.
Do you also claim that fire can’t melt steel?
Did the WTC also collapse due to explosives?