[A]ny transaction fees levied by any bank intervening between the paying bank and the receiving bank (including the paying bank and the receiving bank) shall be deducted from the currencies transferred.
You don't have to. You can withdraw by another method or wait for better times. (Who wants USD anyway? USD will be worthless in just two days.)
Which "other methods" allow a US customer to withdraw their USD from MtGox?
It is difficult for US customers. The problems were created by the US government in the first place (no more redeemable codes for fiat, no more LR, no more Dwolla, etc), so please complain to your government/congressman/president/neighbour. MtGox have very limited options to transfer USD, and have to be very careful not to abuse their options because abuse may interfere with their application to become a payment service. It is possible to make a express manual withdrawal for a 5% bank fee (very limited, available at MtGox's discression), or just wait it out. Trade while you wait, and you may make more USD to withdraw when it is back to normal.