that's a good point. But also people move because of jobs, higher salaries and adequate living conditions (including housing cost). The last one can't be said about Dublin.
Lots of friends of mine moved back to their countries even though wages were lower, but considering prices for food, entertainment and rent at the end of the month they have more money in the pocket.
The Irish are pretty nice when they are drunk. Not all ofc, but with the amount of alcohol been drunk here in Dublin, the amount of drunk fights and things like that is quite low. At least in city centre.
Lived in the Docks for 3 years and every weekend was out in town.