Earlier quoted context omitted.
The obvious solution to a severe shortage in apartments is to build more. Why doesn't Ireland do this? Pigeonhole principle: if K people want to be in Ireland at any one time, and there are N < K apartments, K - N people will have a problem. All the folks criticizing AirBnB want to do is make sure they aren't the ones who face the problem.
> to a severe shortage in apartments You're looking at it wrong. What AirBnB does is allow apartments to be rented as hotel rooms, at prices somewhere in-between. Thus you get mostly empty hotels and lots of mostly empty apartments (1/3 or 1/4 use yields better money than full-time rent). You've inverse-optimized resource usage.
There is a supply and demand tension in Dublin over accommodation. Building more apartments, i.e. increasing supply, will help alleviate this tension. That doesn't mean we can't also tackle the problem from the other direction by reducing demand. AirBnB is demand.
It's hard to tell how much any government would want to pull on a lever that might reduce demand. Those tourists bring valuable outside revenue into the city. We need them too. There's lots to balance here. Let's not optimise just revenue.