They didn't protest Haiti, Somalia, Kosovo, or Bosnia because Western Civilization was not at risk. They protest Vietnam, the Cold War, Afghanistan and Iraq because those conflicts promoted Western security.
In so far as Bush is willing to defend Civilization they are anti-Bush. And, Republicans tend to prosecute wars only when National Security is at risk. Democrats since Vietnam have only promoted conflicts where no National Security was at stake. So, it is coincidental that they protest Bush.
Imagine Clinton prosecuting a War against Saddam. First, he wouldn't because it actually protects civilization. Second, the anti-war crowd would suddenly turn anti-Clinton like they turned anti-Johnson during Vietnam.
How can purported Liberals make common cause with Islamofascists? Because both first require the destruction of Western Civilization in order to found their respective dystopias.
Anti-Bushism is a cover story for opponents of Western Civilization.
Ummm...one problem with that rationale...they supported Clinton's actions in 1998 when he was making noise about Saddam and WMD. Sometimes things are just as simple as they seem...the bottom line is that they just flat-out hate Bush and Republicans.