Hi Hansgru,
I've been considering this quite a bit lately......terrible thing, conscience!
As you point out, when you get down and dirty, it gets pretty subjective.
To get ball rolling and to tease out what would and would not be acceptable to you, I think it would be very useful to consider the top ten stocks in the ISEQ and for you to comment on why you think each particular stock is investment worthy or not by your personal ethical compass. Ideally, a very brief explanation of your rationale would be very helpful.
By market cap, the stocks are:
CRH, Ryanair, Kerry, Paddy Power, BOI, Smurfit, Glanbia, Kingspan, Arzyta and Permanent TSB