The federation hunted the Maquis down as animals after Cardassia helped its DMZ colonists break the treaty - but the federation didn't fail them? Really?
A federation using biological weapons against a federation colony (which threatened to kill men, women, children - citizens of the UFP -, and, in all probability, killed a number of them) because one maquis - Eddington - used a biological weapon, is not a federation that failed its maquis citizens? Ridiculous.
Also - nice to see the ethics of the federation are the ethics of war criminals.
The federation let the its DMZ citizens be massacred without doing a single thing - I guess that, as the federation saw it, it had only rights over them (to hunt them down and poison their colonies for breaking its laws) but no obligations (to protect them).
And this is the federation not failing the Maquis.