9/11 was a much bigger deal than Benghazi and the "Bush did 9/11" conspiracy theory is much more far-reaching than most of the Benghazi theories. The media certainly didn't promote "Bush did 9/11" on the level they've promoted Benghazi, and the amount of support for the 9/11 stuff among US elected officials was/is close to nil.
All of this means Benghazi doesn't even approach "Bush did 9/11" levels of fringe. That's the reality. I know you see the Benghazi stuff as about as realistic as Bush doing 9/11, but trying to frame it like they're equivalent positions to take is disingenuous.
"Some people believe this so it has to be at least partially true!" No.
So far, we know that in hindsight that we should have either had much more security at the consulate in Benghazi or not had any presence there at all. The same could be said about any attack on US facilities overseas which have happened many, many times, notably under Bush II, Clinton and Reagan. But, nobody ever turned those tragic incidents, many worse than Benghazi in terms of lives lost, into a conspiracy theory or had House committees starting brand new investigations on them two and a half years later.
The undercurrent to the Benghazi stuff is that Obama is somehow in league with Islamic terrorists or that there was some greater secret at work in the whole Benghazi story that is being covered up. If that wasn't the case, why would anyone care about investigating this? We already know what happened. And, Rand Paul even brought up a Glenn Beck created conspiracy involving Syria and Turkey and Benghazi while questioning Secretary Clinton.
Now, is it exactly like the 9.11 conspiracy theories on youtube? No. It's tamer I suppose. But, if Democrats kept bringing up 9/11 and accusing Bush of covering up some greater secret or creating partisan witch-hunts, it would be the same. It's a matter of integrity and being a productive member of the government, not a crazy person who foams at the mouth and screams about cover-ups. Democrats never pandered to the idiots in their party who would buy into witch hunts over 9/11. Republicans have with Benghazi and it reflects very poorly on them.
And, this should be especially worrying with Rand Paul. Because he's kind of a conspiracy nut, like his father. Conspiracy nuts are not the sort of people we should elect President.