While Edward Snowden's in exile in Moscow, debate is raging: should President Obama grant him a pardon? Human rights groups, bolstered by Oliver Stone's latest movie, say Snowden performed public service by revealing the excesses of government spying. But others insist that, by breaking the law, Snowden has made it harder for law enforcement to prevent acts of terrorist violence. Meantime, bombs in New York and New Jersey and stabbings in Minnesota are raising all-too-familiar questions about national security. Incidents like these have a direct impact on public opinion about "striking a balance." Is there too much surveillance by government agencies -- or not enough?