Actually their policy is very clearly stated here:
http://www.shamrockrovers.ie/about/r...discrimination
Outside of this website the incident has not gotten any coverage in the national media, the wider public are oblivious. If Shamrock Rovers issued a statement the only possible effect I can see is to placate some of the louder protestors on here, other than that it would just be negative publicity for the league. If this was a serious incident of sustained or even clearly audible abuse it would have been widely reported by now (the national media have never needed an excuse for negative publicity on the league of Ireland), as it is there has been no official complaints made, by the allegedly abused player, his club, the FAI or the Gardaí.
I'm sure Rovers will be reinforcing their stance on racism at the next game and will be continuing their work with show racism the red card, as everyone agrees racism is abhorrent in all it's forms. I still don't see how a statement from Rovers would help matters. I'm sure if the culprit/s can be identified they will be banned and when this happens I'm sure a press release will issue to show that the club is actively combating racism.