U a NAIVE, very naïve 
hey, maybe there's something to it, maybe not. For most people today, it's about as ancient as pearl harbor.
Point is, if 5% of the population looks at it and believes it, then it undermines our govt further. So it doesnt' matter if true or completely falsified, it'll weaken the USA, which isn't a good thing.
It's been almost 15 years. Whatever happened on 911 is nothing but historical record now. BUT something damning from Putin, delievered right before elections, could motivate some, or discourage others. Remember bin laden 'endorsing" John Kerry, 5 days before the 2004 election? BRUTAL, didn't help him one bit lol.
Therefore it wouldn't be a good thing to poke him into releasing it.