For a keen reader you are clueless. The fact that unions can go on strike without the military attacking them does mean the country is stable. But in this case the writer is speaking about Israel as being stable compared to all the surrounding countries that are not stable.
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Clashes between IDF and Palestinians in Joseph's Tomb after Jews pray at site; none hurt (Haaretz)
from the article: Israel remains an 'island of stability' among hostile Islamist movements