This fake narrative that everything Israel does is self-defese is getting old. You can't claim self-defese if you make the first strike. Imagine trying to explain to the cops that you killed the intruder 500 km from your home in self-defense... That's basically your idiotic argument.
It described the barrage as a response to the assassination of senior military commander Fuad Shukr, who was killed in an Israeli strike in Beirut on 30 July.
Assassination doesn't sound very self-defensive...
Its absolutely justified to kill the head of a terrorist organization, it causes chaos and gives the bottom line (many child soldiers especially in case of hezbolla, https://www.dw.com/en/child-soldiers-used-in-yemen-civil-war-report-says/a-49606125) a chance to flee and live their lifes, hezbolla has been firing rockets into Israel for years and after 7. Oktober it where thousands within a few days. Your narrative is quite literally what their propaganda is, that is however absolutely not the truth.
And no, to pick up your analogy, its like killing a organized crime boss that commands his gang of kids to drive-by on your house from time to time because you have another religion/ethnicity.