What level of proof are you looking for? Hezbollah even claimed responsibility then retracted it when it was found to have hit a non-military target.
It seems pretty clear that independent verification of the debris would settle this conclusively. Hasn't happened. Why?
Because it was used as justification for a major escalation.
> Hezbollah attacks against Israel - and there have been literally thousands of such rocket attacks recently.
It does. Hezbollah denied it. They haven't been in the habit of doing that.
> This isn't the type of rocket that Israel uses at all.
Again, you are making claims without possibly being sure of them - unless you take the Israeli government's word for it - you cannot possibly be sure. Neither can I.
Anyhow, as it's clear that you are unwilling to entertain the possibility that this was not a Hezbollah rocket, I don't think there is anything to be gained from continuing this discussion.
I note that you are commenting from Israel. I am not. I'm a long way from this conflict. I hope that you and your loved ones are safe and can soon enjoy the kind of security and freedoms that most of us take for granted.
However, I do owe you an apology. In an earlier comment I claimed that you had implied that Hezbollah was deliberately targeting civilians in this latest conflict and after rereading it seems you haven't made this claim. Sorry.