First, I don't believe that the tower 7 collapse was the result of any kind of conspiracy. If you have ever watched a TV program or read anything about implosion demolition you'll learn that a huge amount of engineering, planning and preperation goes into the demolition. Internal structual members are removed or strategically cut and weakened so they give in a controlled manner during the implosion. This preperation takes weeks. Heat also changes the metalurgy of the metal componets. Think about heat treating. In a controlled manner it strenthens steel. If not done properly disaster can result. When I was a kid way back when I'd camp out with my friend on the back of their family farm. We would routinely "burn" our tin cans in the camp fire. The cans would essetially turn in to paper thin shells that we would stir into the ashes. I have also ruined a good meal on a charcoal grill fire when the grease from the meat flared up and melted the heavy duty aluminim foil the food was in. Neither of these fires were probably as hot as the fire at tower 7. Granted, the metal in these examples was not as heavy as the steel in tower 7.
Second, as far as the single bullet theroy goes, the 6.5 mm bullets as in the 6.5x52 Carcano or the 6.5x55mm Swedish Mauser are legandary for their penetrating ability. The relatively long and heavy bullets belie their paper ballistics. The 6.5x52 Cacano bullet that wounded Kennedy and Connally was a 160 grain full metal jacket bullet. Most theories I'v read that try to debunk the single bullet theroy assume that the bullet always travel a straight path and does not deflect or yaw at all. Bullets can be easilly deflected by twigs, clothing, notebooks in a shirt pocket. car keys etc. It was on the news yesterday that a kid in the Detroit area was shot in the mouth and was saved by his braces, but he did lose his front teeth. I had a friend a few years ago that shot a deer with a 6.5mm 140 grain Swedish Mauser. It was a quartering shot and the deer dropped in it's tracks. When he walked over to claim his buck, he was surprised to find a second deer about 10 feet behind the first that had also dropped in it's tracks. The bullet had gone completely through both deer. It looked as if the bullet went through the second deer sideways as it had been deflected.
Third, I've heard some say that one of the first U.S. victims of Middle East terrorist was Bobby Kennedy by Sirhan Sirhan. Now that is one conspiracy I might be able to believe in.