Are you kidding? Did you even bother to read any of the side stories?
There are more outlaws in Gridania than there are Pirates in Limsa Lominsa. Literally, both story-wise and content-wise.
Check out the FATEs in Quarrymill, where there are AT LEAST 4 different FACTIONS of outlaws there.
Or try the Archer storyline, where you can see just how deadly the outlaws can be.
Then go do the Conjurer and White Mage storyline, where the very forest they live in turns on them.

And then tell me how peaceful Gridania is.

Quite frankly, speaking from an NPC's point of view, Gridania is probably the LEAST SAFEST of the 3 city-states to live in. Even the poor and the refugees in Ul'Dah can live out their lives, although they are starving and have a poor quality of life, they are much less likely to die suddenly.