Asking how to quantify the good and bad that resulted from a thing is something we can ask about literally anything. It's especially hard in this case, because the potential harm was immediate and personal (people being murdered, etc) while the good was broad long-term (a public with greater insight into what its government is doing, etc). But there are plenty of areas with similar tradeoffs; if raising a speed limit lowers commutes for millions of people but raises fatalities by some amount, then that's equally hard to compare.