You can rationally be displeased what you expect the outcome of the case to be (e.g. increased ability for corporate financing of election campaigns), but I don't think there's a coherent defense of the sections of BCRA that the court struck down.

ETA: The government argued that BCRA would allow them to ban, for example, a 500 page book that contained a single sentence endorsing a candidate (http://reason.com/archives/2010/06/29/will-elena-kagan-allow...). If you think SOPA is heavy-handed, just think what BCRA could have led to.