Usage and explanation of "no more ... than"
Solution 1:
The prosecution, allegedly, wanted to "defend black women"
The defense (adj: spirited), allegedly, wanted to "defend the entire black community"
This sentence is saying that neither of these were the case, and as "spirited" and believable as the defense was, it was not genuinely about 'defending the black community,' but then again, neither was the prosecution genuine about "defending black women" (by prosecuting the alleged perpetrators).
[The spirited defense of 2 Live Crew was--] [no more] [--about defending the entire black community] [than] [the prosecution was about defending black women]
The purpose of this complicated construction is for rhetoric.