"We are not afraid of the dark"

While my other holiday snaps have tended towards the more picturesque, there is no denying the extraordinary amount of graffiti in Pisa.
My Italian is less than basic, but the bulk of the slogans seemed to be Communist or anarchist in their thrust. A reaction, presumably, to the right-wing Berlusconi & Italy's economic problems.
However, as the Italians invented graffiti, I suppose it's approriate. But I can't claim to understand the relevence of the second line. Perhaps Google Translate let me down!