So basically... if your buddy fucks your girlfriend and you didn't see it happen, then it didn't really happen? Come on now. Wake up and smell the maple nut crunch. Are you that naive?

edit: or an even better analogy. your buddy has been fucking your girlfriend for a long time. you know it, the whole town knows it and a lot of people have even seen it. she tells you that they're not fucking and haven't for a long time. half of the town is telling you that they saw your girlfriend and your buddy bangin in the bushes at the park last week. whom do you believe? it's the same scenario. until there is documented evidence that the WMD have been eliminated from Iraq, common sense tells me to believe that there are still in fact WMD hidden somewhere in that country.