Well betraying duty and betraying humanity's principles, which were the charges Sisko and Janeway were using respectively are different. Subtlety so at times, but nevertheless.
The funny thing about this episode is... flash back to Year of Hell when Janeway had the busted up ship. Look at her irrational behavior then, and compare her to Ransom. Are they so different? If the combustible space slug had been dropped into Janeway's lap, would she really not have used it?