Not supply and demand according to this. Not that pointing it out will fix anything.
Theres also this Guardian article saying 30 thousand vacant homes in the "greater dublin area" although I'm not sure how accurate that is (you could halve it and still solve the homeless crisis overnight)
30,000 empty homes and nowhere to live: inside Dublin’s housing crisis
Dublin’s landlords would rather put their properties on Airbnb than rent to local families. There are echoes in cities around the world
www.theguardian.com
The problem is the will to do it, not an inability to do it. Its a completely shameful situation.