Lets say Swedish spies was sent to the US in order to infiltrate and weaken the 911 system, the power grid, or other key infrastructures of the US. Would you shrug at that also, since after all, what should people expect from spies?
Sabotage and spying is two different activities. Sabotage is a tactic employed during war. Spying is a tactic employed during peace. Confusing the two simply states that peace is war, and war is peace, and anything goes so long its against foreigners.