I hate to respond to a thread bumped by some dolt that's two years old, but voting for Fianna Fáil in 1932, at least, was not only one of the few occasions where voting FF is justifiable but a near-moral imperative.
Labour were supporting FF in 1932 but you could probably make a case for the "near-moral imperative" through a lot of the 30s, given CnaG/FG's shirt-wearing during the period. ("NO! We weren't FASCISTS! We just wanted to abolish democracy and install a one-party corporate state with ourselves in charge! THAT'S COMPLETELY DIFFERENT!")
The tragedy about 1977 is that FF could have won it without a lot of the over-the-top goodies (rates, car tax) that they resorted to in the (mistaken) belief that there was no other way to overcome the Tullymander.