Why does Israel strike Gaza?

Israeli guy telling the truth of Israel - Palestine war, which any media doesn't show you. Don't believe on any media reports, which hide the truth and spreading fake news. Nowadays, every media reports headlines are Israel strike Gaza, Israel destroy buildings in Gaza, Israel attack on Gaza, Israel attacking on civilians in Gaza etc. But 80% of media reports are covering one-sided story and blaming Israel for this. 

Recently Israel destroy media office building in Gaza which was used by Hamas for their terrorist activities against Israel and after that media reported this attack by showing there is no any terrorist camp of Hamas inside or outside of the building and totally blamed Israel for this attack by saying "the main target of Israel is media offices not Hamas". This Israeli guy exposed all those media reports who hiding the truth and spreading fake news to blame Israel for breaking peace between two nations. 

Why does Israel strike Gaza?