From the link-
"Hamas, the militant group that has run Gaza since 2007 and does not recognize Israel’s right to exist, has parlayed the arsenal into an increasingly lethal threat,..."
"They assemble the rockets underground or in dense neighborhoods where Israeli airstrikes are likely to cause civilian casualties."
So, who's the bad guy? Firing on the source of the rockets, or building and firing from residential areas?
Despite a blockade, Palestinian militants have used help from Iran, ingenuity, Israeli-fired duds and even plumbing pipes to make thousands of rockets with increased range.
www.nytimes.com