These conspiracy theories are mostly just ways to Bash Bush. They really don't believe them, but they get the extreme leftist wackos worked up who WILL believe these theories.
The only problem with giving credence to all of these theories is that one day soon, the Leaders of the Lefties will lose control of the extremists. DU makes up a new conspiracy every day. They will use ANYTHING that they find on the internet as proof, even if they wrote it themselves and then linked to it.