Only recently have I been rethinking 9/11... why has the government lied to us so much?

How could a plane hit the pentagon and "vaporise upon impact" and they still found a 'hijackers' intact pport. Why do the WTC collapses 1, 2, & 7 look so much like a controlled demolition? How is it that there were tons and tons of molten steel at 2100 degrees C when jet fuel burns at a maximum of 1000 degrees C in the WTC buildings? Theres just too much unexplained, crap on top of all the BS and lies they feed us for me to believe the governments story about anything anymore.