While cheating can be extremely damaging to most relationships, an affair actually begins long before the act itself. Having an affair is often one person's way of signaling to their partner that something is wrong in the relationship. And, often one person uses cheating as a catalyst to either fix or flee from the problems.
Let's be clear -- no one who signed up for Ashley Madison has committed a crime or participated in illegal activity. Shouldn't we be channelling our outrage towards a group of hackers for taking it upon themselves to determine what's immoral and what's appropriate conduct on the Internet? Using cyber-terrorism as a tool to shame people who may not navigate by the same moral compass as you is not only the ultimate breach in privacy; it's an attack on net neutrality. Imposing fear on people for how they behave online is just as repressive as restricting certain behaviours and content in the first place.