Having military base itself is nothing wrong, nor is sharing intelligence in itself.
But the german citizen would be responsible if their government is engaged in so called pre-emptive war, under the pretense of terrorism and engaged in multi-year war with thousands of deaths and the citizens didn't even lift a finger.
Similarly if the german government is engaged in country-wide surveillance program under the pretense of security to control and possibly suppress its citizen, then yes the citizen is absolutely responsible if they sit on their ass for years and do nothing about it.
But the german citizen would be responsible if their government is engaged in so called pre-emptive war, under the pretense of terrorism and engaged in multi-year war with thousands of deaths and the citizens didn't even lift a finger.
Similarly if the german government is engaged in country-wide surveillance program under the pretense of security to control and possibly suppress its citizen, then yes the citizen is absolutely responsible if they sit on their ass for years and do nothing about it.