It's an Israeli city in the north with literally nothing resembling military value. It might have been targeted, but if you're so inaccurate you might hit a soccer field many kilometers from anything like a military target, then perhaps you don't care about murdering civilians.
The only thing that was special about *this* rocket is that it killed those poor kids.
Because Hezbollah has fired many, many, many rockets over the last decades. Many many. Maybe not quite as many as those fired from Gaza, which was in the tens of thousands.
