Don't think of your FMs as lazy(although they become lazy^^) think of them as ambitious and proud.
they don't like beeing "dumped" in a small, remote, provincial city with nothing going on, while their cousins are bashing in roman helmets ( actually I am reffering to Asterix) and get all the glory for themselves. they get the feeling of not beeing liked by the nobles' council and rather go to the local inn to get drunk and forget all about it. which is an option as they don't hae utterly much to do.

afaik sweboz(and nomads) get the trait rather easy compared to other civs. not only because of the smaller settlement size.