No, you cant compare this to 9/11. The problem is that this building has a completely different method of construction. They used primarily concrete with rebar to construct it. The reason it collapsed, that I can make an educated guess on without even seeing up close pictures or detailed reports, is because they very likely didnt tie the rebar together like they should have(and possibly didnt use enough rebar), and used substandard concrete or just plain cement. Since its very likely the rebar was not tied, or not tied properly, once the concrete started to crack/crumble, it pulled the rebar right out without any trouble at all.
To climb the mountain, you must believe you can.