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Don't take anything someone says at face value just because they have a PhD. A lot of people with PhDs (you'd be surprised) have no idea what they're talking about. Just because someone has an education doesn't mean they're immune to believing really wacky things. In fact, sometimes it makes them more vulnerable to such things because they're smart enough to piece together a complex, scientific-sounding, convincing theory.
It so happens that PhD-holders often disagree about things, this being one of them. I'm not surprised you can find people with PhDs who agree with you, since you can find a few PhDs who believe in almost any idea...these people are human after all. However, you have to realize that most of them won't agree with you because the evidence just isn't there.
are you looking at the world with stevie wonder's glasses on? I'm not saying that b/c they have a PHD their theory is correct. What I want you to connect with is that if a person with a PHD in Physics tell you it is impossible for a building to collapse in the amount of time it did, with no outside force other than the "melting steel", than it's something you should take into strong consideration. and how is the evidence not there?; how much about 9/11 have you read?