Robert Comsol wrote:
This was neither Decker's or Maxwell's attitude nor intention. Captain Maxwell was frustrated and embittered but he wouldn't cross this line and start a war with the Cardassians at the expense of Starfleet and his fellow officers.
Deckers situation was entirely different but he'd have had no issue sacrificing the Enterprise
crew in his obviously futile attempt to destroy the Doomsday Machine from the outside. And Maxwell executed at least six hundred-fifty Cardassians before Picard intervened.
Both had no issue sacrificing fellow Starfleet personnel in order to achieve their objectives.