I don't think anyone's saying that. You're creating a false distinction, that if anyone's against the anti-communist authoritarian military dictatorship of Pinochet they're automatically for Allende's communism. That's just a fallacy.
Sorry, but we cannot remove ourselves from that time. You either stood with Allende or supported Pinochet. It's easy to sit back in 2006 in America and condemn everyone, but in 1973 Chile tough choices had to be made.
So how would you have taken out Allende before he had a chance to launch the typical Communist campaign of genocidal terror?