Bush: Use of Force is Last Resort - WHY?

Why wait for something drastic to happen? - this is the question that arises from the announcement president Bush made on Iran from his ranch yesterday - allowing Iran to defy U.N.'s seals and re-open its nuclear program is analogous of letting Hitler have Czechoslovakia and hoping his aggression will stop there. We need to take a decisive action now, and take out terrorist-supporting regime in Iran along with their nuke plant - it worked in 1981 with Iraq - nothing a few designated MOAB air strikes wouldn't solve - but it has to be done NOW.