Yes, a Floyd fan here as well and, to be honest, I was not a Roger Waters fan initially, but I've come round to respect his right to an opinion & his pacifist views.
Having said that, he's using his right to "free speech" in such a way that it could lead to a more confrontational stance from Argentina (Not saying he'll be the one to influence their policy) and possibly embolden their resolve. This could, sadly, lead to casualties on both sides even if it doesn't come to a military conflict.
Fine. Have your views Roger, but for pity's sake, think of the consequences for those who are directly affected by this issue!